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Prova de 2017: Universidade Estadual do Ceará (UECE) — questões com gabarito

110 questões da prova de 2017 de Universidade Estadual do Ceará (UECE), em Matemática, Português, Inglês, Biologia e mais matérias. Cada uma tem página própria, com enunciado completo, alternativas e gabarito — e dá para responder na própria página.

  • 110 questões

Resultados: 110 questões

Página 4 de 6

  • Linguagens

    Português

    Imagem da questão de Português, UECE 2017, Flexão verbal de modo (indicativo, subjuntivo, imperativo)

    Sabe-se que o pretérito mais-que-perfeito do indicativo é empregado quando se quer mencionar um passado que ocorreu antes de outro passado. Atente ao emprego desse tempo verbal no excerto abaixo e ao que se diz em seguida.


    “Luciana quis aproximar-se das pessoas grandes, mas lembrou-se do que lhe tinha acontecido na véspera. Andara com mamãe pela cidade, percorrera diversas ruas, satisfeita. Num lugar feio e escorregadio, onde a água da chuva empoçava, resistira, acuara e caíra no chão, sentara-se na lama, esperneando e berrando. Em casa, antes de tirar-lhe a camisa suja, mamãe lhe infligira três palmadas enérgicas. Por quê? Luciana passara o dia tentando reconciliar-se com o ser poderoso que lhe magoara as nádegas.” (linhas 10- 21)


    I. Há, no início do excerto transcrito, formas do pretérito perfeito do indicativo.

    II. Tinha acontecido é uma locução verbal que configura o mais-que-perfeito composto, equivalendo, portanto, à forma simples, acontecera.

    III. Das formas do pretérito perfeito, a que vai determinar o emprego do pretérito-mais-que-perfeito, no excerto transcrito (andara, percorrera, resistira, acuara, caíra e sentara) é lembrou. Todas essas ações ocorreram antes da lembrança, do contrário não poderiam ser lembradas.


    Está correto o que se diz em

    Escolha uma alternativa para a questão db51d0c1-cb
  • Linguagens

    Português

    Imagem da questão de Português, UECE 2017, Flexão verbal de tempo (presente, pretérito, futuro)

    Atente ao que se diz sobre as orações do seguinte excerto: “Ouvindo rumor na porta da frente e os passos conhecidos de tio Severino, Luciana ergueu-se estouvada, saiu do corredor, entrou na sala, parou indecisa, esperando que a chamassem. Ninguém reparou nela”. (linhas 1-5)


    I. A primeira oração, construída com o verbo ouvir no gerúndio, pode ser reescrita da seguinte maneira: (Quando ouviu rumor na porta da frente e os passos conhecidos de tio Severino, Luciana...).

    II. Os verbos empregados no pretérito perfeito do indicativo sugerem que as ações de Luciana (ergueu-se, saiu, entrou, parou) foram percebidas pelo narrador depois de concluídas.

    III. Embora sem um conectivo que evidencie uma relação semântica entre as últimas orações do trecho, pode-se depreender um sentido de adição (e esperou) e de oposição (chamassem, mas), ligando-as.


    Está correto o que se diz em

    Escolha uma alternativa para a questão db4685a5-cb
  • Linguagens

    Português

    Imagem da questão de Português, UECE 2017, Coesão e coerência

    Releia com atenção o trecho que fica entre as linhas 17 e 23: “Em casa, antes de tirar-lhe a camisa suja, mamãe lhe infligira três palmadas enérgicas. Por quê? Luciana passara o dia tentando reconciliar-se com o ser poderoso que lhe magoara as nádegas. Agora, na presença da visita, essa criatura forte não anunciava perigo”. Nesse trecho aparecem três vocábulos e/ou expressões que se referem à mãe de Luciana. São expressões referenciais, com as quais podem ser construídas quatro diferentes sequências. Uma delas foi organizada de modo a formar uma gradação ascendente com um forte clímax. Essas expressões referenciais são responsáveis pelas mudanças que o referente sofre durante o desenvolvimento do discurso. A sequência que expressa a gradação ascendente é
    Escolha uma alternativa para a questão db431da8-cb
  • Linguagens

    Português

    Imagem da questão de Português, UECE 2017, Interpretação de Textos

    Assinale a opção que descreve corretamente quem era D. Henriqueta da Boa-Vista e o que ela representava para Luciana.
    Escolha uma alternativa para a questão db374e36-cb
  • Linguagens

    Português

    Imagem da questão de Português, UECE 2017, Interpretação de Textos

    No conto “Luciana”, Graciliano Ramos focaliza uma das fases do desenvolvimento humano, a infância. Dentre os excertos abaixo, extraídos de obras que falam sobre a infância, assinale aquele cujo conteúdo é compatível com a visão de infância que Graciliano Ramos transmite no conto supracitado.
    Escolha uma alternativa para a questão db2f681c-cb
  • Linguagens

    Inglês

                                               T E X T


          As growth slows in wealthy countries, Western food companies are aggressively expanding in developing nations, contributing to obesity and health problems.

          FORTALEZA, Brazil — Children’s squeals rang through the muggy morning air as a woman pushed a gleaming white cart along pitted, trash-strewn streets. She was making deliveries to some of the poorest households in this seaside city, bringing pudding, cookies and other packaged foods to the customers on her sales route.

          Celene da Silva, 29, is one of thousands of door-to-door vendors for Nestlé, helping the world’s largest packaged food conglomerate expand its reach into a quarter-million households in Brazil’s farthestflung corners.

          As she dropped off variety packs of Chandelle pudding, Kit-Kats and Mucilon infant cereal, there was something striking about her customers: Many were visibly overweight, even small children.

          She gestured to a home along her route and shook her head, recalling how its patriarch, a morbidly obese man, died the previous week. “He ate a piece of cake and died in his sleep,” she said.

          Mrs. da Silva, who herself weighs more than 200 pounds, recently discovered that she had high blood pressure, a condition she acknowledges is probably tied to her weakness for fried chicken and the Coca-Cola she drinks with every meal, breakfast included.

          Nestlé’s direct-sales army in Brazil is part of a broader transformation of the food system that is delivering Western-style processed food and sugary drinks to the most isolated pockets of Latin America, Africa and Asia. As their growth slows in the wealthiest countries, multinational food companies like Nestlé, PepsiCo and General Mills have been aggressively expanding their presence in developing nations, unleashing a marketing juggernaut that is upending traditional diets from Brazil to Ghana to India.

          A New York Times examination of corporate records, epidemiological studies and government reports — as well as interviews with scores of nutritionists and health experts around the world — reveals a sea change in the way food is produced, distributed and advertised across much of the globe. The shift, many public health experts say, is contributing to a new epidemic of diabetes and heart disease, chronic illnesses that are fed by soaring rates of obesity in places that struggled with hunger and malnutrition just a generation ago.

          The new reality is captured by a single, stark fact: Across the world, more people are now obese than underweight. At the same time, scientists say, the growing availability of high-calorie, nutrient-poor foods is generating a new type of malnutrition, one in which a growing number of people are both overweight and undernourished.

          “The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,” said Anthony Winson, who studies the political economics of nutrition at the University of Guelph in Ontario. A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

          Even critics of processed food acknowledge that there are multiple factors in the rise of obesity, including genetics, urbanization, growing incomes and more sedentary lives. Nestlé executives say their products have helped alleviate hunger, provided crucial nutrients, and that the company has squeezed salt, fat and sugar from thousands of items to make them healthier. But Sean Westcott, head of food research and development at Nestlé, conceded obesity has been an unexpected side effect of making inexpensive processed food more widely available.

          “We didn’t expect what the impact would be,” he said.

          Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food. Nestlé, he said, strives to educate consumers about proper portion size and to make and market foods that balance “pleasure and nutrition.”

          There are now more than 700 million obese people worldwide, 108 million of them children, according to research published recently in The New England Journal of Medicine. The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found. 

                                                                                   By ANDREW JACOBS and MATT RICHTEL

                                                      The New York Times SEPT. 16, 2017 https://www.nytimes.com

    According to the text, a striking feature of Celene da Silva's customers is that many of them
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  • Linguagens

    Inglês

                                               T E X T


          As growth slows in wealthy countries, Western food companies are aggressively expanding in developing nations, contributing to obesity and health problems.

          FORTALEZA, Brazil — Children’s squeals rang through the muggy morning air as a woman pushed a gleaming white cart along pitted, trash-strewn streets. She was making deliveries to some of the poorest households in this seaside city, bringing pudding, cookies and other packaged foods to the customers on her sales route.

          Celene da Silva, 29, is one of thousands of door-to-door vendors for Nestlé, helping the world’s largest packaged food conglomerate expand its reach into a quarter-million households in Brazil’s farthestflung corners.

          As she dropped off variety packs of Chandelle pudding, Kit-Kats and Mucilon infant cereal, there was something striking about her customers: Many were visibly overweight, even small children.

          She gestured to a home along her route and shook her head, recalling how its patriarch, a morbidly obese man, died the previous week. “He ate a piece of cake and died in his sleep,” she said.

          Mrs. da Silva, who herself weighs more than 200 pounds, recently discovered that she had high blood pressure, a condition she acknowledges is probably tied to her weakness for fried chicken and the Coca-Cola she drinks with every meal, breakfast included.

          Nestlé’s direct-sales army in Brazil is part of a broader transformation of the food system that is delivering Western-style processed food and sugary drinks to the most isolated pockets of Latin America, Africa and Asia. As their growth slows in the wealthiest countries, multinational food companies like Nestlé, PepsiCo and General Mills have been aggressively expanding their presence in developing nations, unleashing a marketing juggernaut that is upending traditional diets from Brazil to Ghana to India.

          A New York Times examination of corporate records, epidemiological studies and government reports — as well as interviews with scores of nutritionists and health experts around the world — reveals a sea change in the way food is produced, distributed and advertised across much of the globe. The shift, many public health experts say, is contributing to a new epidemic of diabetes and heart disease, chronic illnesses that are fed by soaring rates of obesity in places that struggled with hunger and malnutrition just a generation ago.

          The new reality is captured by a single, stark fact: Across the world, more people are now obese than underweight. At the same time, scientists say, the growing availability of high-calorie, nutrient-poor foods is generating a new type of malnutrition, one in which a growing number of people are both overweight and undernourished.

          “The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,” said Anthony Winson, who studies the political economics of nutrition at the University of Guelph in Ontario. A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

          Even critics of processed food acknowledge that there are multiple factors in the rise of obesity, including genetics, urbanization, growing incomes and more sedentary lives. Nestlé executives say their products have helped alleviate hunger, provided crucial nutrients, and that the company has squeezed salt, fat and sugar from thousands of items to make them healthier. But Sean Westcott, head of food research and development at Nestlé, conceded obesity has been an unexpected side effect of making inexpensive processed food more widely available.

          “We didn’t expect what the impact would be,” he said.

          Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food. Nestlé, he said, strives to educate consumers about proper portion size and to make and market foods that balance “pleasure and nutrition.”

          There are now more than 700 million obese people worldwide, 108 million of them children, according to research published recently in The New England Journal of Medicine. The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found. 

                                                                                   By ANDREW JACOBS and MATT RICHTEL

                                                      The New York Times SEPT. 16, 2017 https://www.nytimes.com

    According to Sean Westcott, as people have the means to buy more food, they tend to
    Escolha uma alternativa para a questão 825b5e38-e5
  • Linguagens

    Inglês

                                               T E X T


          As growth slows in wealthy countries, Western food companies are aggressively expanding in developing nations, contributing to obesity and health problems.

          FORTALEZA, Brazil — Children’s squeals rang through the muggy morning air as a woman pushed a gleaming white cart along pitted, trash-strewn streets. She was making deliveries to some of the poorest households in this seaside city, bringing pudding, cookies and other packaged foods to the customers on her sales route.

          Celene da Silva, 29, is one of thousands of door-to-door vendors for Nestlé, helping the world’s largest packaged food conglomerate expand its reach into a quarter-million households in Brazil’s farthestflung corners.

          As she dropped off variety packs of Chandelle pudding, Kit-Kats and Mucilon infant cereal, there was something striking about her customers: Many were visibly overweight, even small children.

          She gestured to a home along her route and shook her head, recalling how its patriarch, a morbidly obese man, died the previous week. “He ate a piece of cake and died in his sleep,” she said.

          Mrs. da Silva, who herself weighs more than 200 pounds, recently discovered that she had high blood pressure, a condition she acknowledges is probably tied to her weakness for fried chicken and the Coca-Cola she drinks with every meal, breakfast included.

          Nestlé’s direct-sales army in Brazil is part of a broader transformation of the food system that is delivering Western-style processed food and sugary drinks to the most isolated pockets of Latin America, Africa and Asia. As their growth slows in the wealthiest countries, multinational food companies like Nestlé, PepsiCo and General Mills have been aggressively expanding their presence in developing nations, unleashing a marketing juggernaut that is upending traditional diets from Brazil to Ghana to India.

          A New York Times examination of corporate records, epidemiological studies and government reports — as well as interviews with scores of nutritionists and health experts around the world — reveals a sea change in the way food is produced, distributed and advertised across much of the globe. The shift, many public health experts say, is contributing to a new epidemic of diabetes and heart disease, chronic illnesses that are fed by soaring rates of obesity in places that struggled with hunger and malnutrition just a generation ago.

          The new reality is captured by a single, stark fact: Across the world, more people are now obese than underweight. At the same time, scientists say, the growing availability of high-calorie, nutrient-poor foods is generating a new type of malnutrition, one in which a growing number of people are both overweight and undernourished.

          “The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,” said Anthony Winson, who studies the political economics of nutrition at the University of Guelph in Ontario. A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

          Even critics of processed food acknowledge that there are multiple factors in the rise of obesity, including genetics, urbanization, growing incomes and more sedentary lives. Nestlé executives say their products have helped alleviate hunger, provided crucial nutrients, and that the company has squeezed salt, fat and sugar from thousands of items to make them healthier. But Sean Westcott, head of food research and development at Nestlé, conceded obesity has been an unexpected side effect of making inexpensive processed food more widely available.

          “We didn’t expect what the impact would be,” he said.

          Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food. Nestlé, he said, strives to educate consumers about proper portion size and to make and market foods that balance “pleasure and nutrition.”

          There are now more than 700 million obese people worldwide, 108 million of them children, according to research published recently in The New England Journal of Medicine. The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found. 

                                                                                   By ANDREW JACOBS and MATT RICHTEL

                                                      The New York Times SEPT. 16, 2017 https://www.nytimes.com

    Anthony Winson, from Ontario's University of Guelph, says we have low-priced food which is widely available but it
    Escolha uma alternativa para a questão 82587a36-e5
  • Linguagens

    Inglês

                                               T E X T


          As growth slows in wealthy countries, Western food companies are aggressively expanding in developing nations, contributing to obesity and health problems.

          FORTALEZA, Brazil — Children’s squeals rang through the muggy morning air as a woman pushed a gleaming white cart along pitted, trash-strewn streets. She was making deliveries to some of the poorest households in this seaside city, bringing pudding, cookies and other packaged foods to the customers on her sales route.

          Celene da Silva, 29, is one of thousands of door-to-door vendors for Nestlé, helping the world’s largest packaged food conglomerate expand its reach into a quarter-million households in Brazil’s farthestflung corners.

          As she dropped off variety packs of Chandelle pudding, Kit-Kats and Mucilon infant cereal, there was something striking about her customers: Many were visibly overweight, even small children.

          She gestured to a home along her route and shook her head, recalling how its patriarch, a morbidly obese man, died the previous week. “He ate a piece of cake and died in his sleep,” she said.

          Mrs. da Silva, who herself weighs more than 200 pounds, recently discovered that she had high blood pressure, a condition she acknowledges is probably tied to her weakness for fried chicken and the Coca-Cola she drinks with every meal, breakfast included.

          Nestlé’s direct-sales army in Brazil is part of a broader transformation of the food system that is delivering Western-style processed food and sugary drinks to the most isolated pockets of Latin America, Africa and Asia. As their growth slows in the wealthiest countries, multinational food companies like Nestlé, PepsiCo and General Mills have been aggressively expanding their presence in developing nations, unleashing a marketing juggernaut that is upending traditional diets from Brazil to Ghana to India.

          A New York Times examination of corporate records, epidemiological studies and government reports — as well as interviews with scores of nutritionists and health experts around the world — reveals a sea change in the way food is produced, distributed and advertised across much of the globe. The shift, many public health experts say, is contributing to a new epidemic of diabetes and heart disease, chronic illnesses that are fed by soaring rates of obesity in places that struggled with hunger and malnutrition just a generation ago.

          The new reality is captured by a single, stark fact: Across the world, more people are now obese than underweight. At the same time, scientists say, the growing availability of high-calorie, nutrient-poor foods is generating a new type of malnutrition, one in which a growing number of people are both overweight and undernourished.

          “The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,” said Anthony Winson, who studies the political economics of nutrition at the University of Guelph in Ontario. A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

          Even critics of processed food acknowledge that there are multiple factors in the rise of obesity, including genetics, urbanization, growing incomes and more sedentary lives. Nestlé executives say their products have helped alleviate hunger, provided crucial nutrients, and that the company has squeezed salt, fat and sugar from thousands of items to make them healthier. But Sean Westcott, head of food research and development at Nestlé, conceded obesity has been an unexpected side effect of making inexpensive processed food more widely available.

          “We didn’t expect what the impact would be,” he said.

          Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food. Nestlé, he said, strives to educate consumers about proper portion size and to make and market foods that balance “pleasure and nutrition.”

          There are now more than 700 million obese people worldwide, 108 million of them children, according to research published recently in The New England Journal of Medicine. The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found. 

                                                                                   By ANDREW JACOBS and MATT RICHTEL

                                                      The New York Times SEPT. 16, 2017 https://www.nytimes.com

    The text mentions that some multinational food companies have
    Escolha uma alternativa para a questão 8252ca6b-e5
  • Linguagens

    Inglês

                                               T E X T


          As growth slows in wealthy countries, Western food companies are aggressively expanding in developing nations, contributing to obesity and health problems.

          FORTALEZA, Brazil — Children’s squeals rang through the muggy morning air as a woman pushed a gleaming white cart along pitted, trash-strewn streets. She was making deliveries to some of the poorest households in this seaside city, bringing pudding, cookies and other packaged foods to the customers on her sales route.

          Celene da Silva, 29, is one of thousands of door-to-door vendors for Nestlé, helping the world’s largest packaged food conglomerate expand its reach into a quarter-million households in Brazil’s farthestflung corners.

          As she dropped off variety packs of Chandelle pudding, Kit-Kats and Mucilon infant cereal, there was something striking about her customers: Many were visibly overweight, even small children.

          She gestured to a home along her route and shook her head, recalling how its patriarch, a morbidly obese man, died the previous week. “He ate a piece of cake and died in his sleep,” she said.

          Mrs. da Silva, who herself weighs more than 200 pounds, recently discovered that she had high blood pressure, a condition she acknowledges is probably tied to her weakness for fried chicken and the Coca-Cola she drinks with every meal, breakfast included.

          Nestlé’s direct-sales army in Brazil is part of a broader transformation of the food system that is delivering Western-style processed food and sugary drinks to the most isolated pockets of Latin America, Africa and Asia. As their growth slows in the wealthiest countries, multinational food companies like Nestlé, PepsiCo and General Mills have been aggressively expanding their presence in developing nations, unleashing a marketing juggernaut that is upending traditional diets from Brazil to Ghana to India.

          A New York Times examination of corporate records, epidemiological studies and government reports — as well as interviews with scores of nutritionists and health experts around the world — reveals a sea change in the way food is produced, distributed and advertised across much of the globe. The shift, many public health experts say, is contributing to a new epidemic of diabetes and heart disease, chronic illnesses that are fed by soaring rates of obesity in places that struggled with hunger and malnutrition just a generation ago.

          The new reality is captured by a single, stark fact: Across the world, more people are now obese than underweight. At the same time, scientists say, the growing availability of high-calorie, nutrient-poor foods is generating a new type of malnutrition, one in which a growing number of people are both overweight and undernourished.

          “The prevailing story is that this is the best of all possible worlds — cheap food, widely available. If you don’t think about it too hard, it makes sense,” said Anthony Winson, who studies the political economics of nutrition at the University of Guelph in Ontario. A closer look, however, reveals a much different story, he said. “To put it in stark terms: The diet is killing us.”

          Even critics of processed food acknowledge that there are multiple factors in the rise of obesity, including genetics, urbanization, growing incomes and more sedentary lives. Nestlé executives say their products have helped alleviate hunger, provided crucial nutrients, and that the company has squeezed salt, fat and sugar from thousands of items to make them healthier. But Sean Westcott, head of food research and development at Nestlé, conceded obesity has been an unexpected side effect of making inexpensive processed food more widely available.

          “We didn’t expect what the impact would be,” he said.

          Part of the problem, he added, is a natural tendency for people to overeat as they can afford more food. Nestlé, he said, strives to educate consumers about proper portion size and to make and market foods that balance “pleasure and nutrition.”

          There are now more than 700 million obese people worldwide, 108 million of them children, according to research published recently in The New England Journal of Medicine. The prevalence of obesity has doubled in 73 countries since 1980, contributing to four million premature deaths, the study found. 

                                                                                   By ANDREW JACOBS and MATT RICHTEL

                                                      The New York Times SEPT. 16, 2017 https://www.nytimes.com

    According to the text, the huge change in the way food is produced and distributed worldwide is one of the reasons for the
    Escolha uma alternativa para a questão 824a767b-e5
  • Ciências da Natureza

    Biologia

    De acordo com as teorias sobre a origem da vida, é correto afirmar que
    Escolha uma alternativa para a questão 8244c8c4-e5
  • Ciências da Natureza

    Biologia

    As folhas apresentam formas variadas resultantes das adaptações necessárias para que as plantas habitem ambientes diversos. Considerando a anatomia foliar das angiospermas, assinale a afirmação verdadeira.
    Escolha uma alternativa para a questão 8241e4fd-e5
  • Ciências da Natureza

    Biologia

    Em relação à herança, assinale com V ou F conforme seja verdadeiro ou falso o que se afirma a seguir.


    ( ) Na dominância completa, os heterozigotos apresentam fenótipo intermediário entre os dos homozigotos.

    ( ) Quando ocorre a codominância, os heterozigotos apresentam o mesmo fenótipo de um dos homozigotos.

    ( ) Alelos letais causam a morte de seus portadores e são considerados: dominante, quando apenas um está presente; ou recessivo, quando os dois estão presentes.

    ( ) A pleiotropia é o fenômeno em que o gene determina a expressão de mais de uma característica.


    Está correta, de cima para baixo, a seguinte sequência:

    Escolha uma alternativa para a questão 823ee496-e5
  • Ciências da Natureza

    Biologia

    Atente ao que se afirma a seguir sobre células do tecido sanguíneo:


    I. Neutrófilos são leucócitos agranulosos que têm função de defesa e atuam na fagocitose de micro-organismos invasores e partículas estranhas.

    II. Basófilos são leucócitos granulosos relacionados à liberação de heparina e de histamina; também são relacionados a diversos tipos de alergia.

    III. Monócitos são células efêmeras na corrente sanguínea, pois migram para tecidos específicos, como por exemplo, baço e pulmões, onde se transformam em macrófagos.


    Está correto o que se afirma em

    Escolha uma alternativa para a questão 823959a8-e5
  • Ciências da Natureza

    Biologia

    Analise as seguintes afirmações sobre membrana plasmática e assinale-as com V ou F conforme sejam verdadeiras ou falsas.


    ( ) Cada tipo de membrana possui proteínas específicas que funcionam como portas de entrada e saída de moléculas do meio interno para o meio externo à célula, e vice versa.

    ( ) Mosaico fluido é o modelo válido para explicar a membrana plasmática, mas não para as membranas que envolvem as organelas celulares.

    ( ) As proteínas periféricas se encontram embutidas nas membranas, interagindo fortemente com as porções hidrofóbicas dos lipídios e, por essa razão, são de difícil isolamento em laboratório.

    ( ) O2, CO2, ácidos graxos e hormônios esteroides são substâncias que entram e saem da célula por difusão simples, pois o movimento acontece apenas pela força do gradiente de concentração.


    A sequência correta, de cima para baixo, é:

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  • Ciências da Natureza

    Química

                         Figura 1 de 2 da questão de Química, UECE 2017, Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.

    A má alimentação é responsável por diversos problemas de saúde no ser humano como, por exemplo, a obesidade. Para contornar, em parte, essa situação, a indústria alimentícia produz alimentos classificados como “light”, que apresentam uma diferença para menos de 25% no valor energético ou de nutrientes do produto original, e os que são classificados como “diet”, formulados com modificações no conteúdo de nutrientes. O aspartame é utilizado como adoçante artificial tanto nos alimentos “light” quanto nos alimentos “diet”. Assinale a opção que apresenta correta e respectivamente a fórmula molecular e a massa molar aproximada do aspartame.

    Figura 2 de 2 da questão de Química, UECE 2017, Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.
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  • Ciências da Natureza

    Química

                         Figura 1 de 2 da questão de Química, UECE 2017, Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.

    Os flavorizantes são produzidos em grande quantidade em substituição às substâncias naturais. Por exemplo, a produção da essência de abacaxi usada em preparados para bolos é obtida através da reação de esterificação realizada com aquecimento intenso e sob refluxo. Atente aos compostos I e II apresentados a seguir:


    Figura 2 de 2 da questão de Química, UECE 2017, Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.

    Os nomes dos compostos orgânicos I e II são respectivamente
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  • Ciências da Natureza

    Química

                         Imagem da questão de Química, UECE 2017, Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.

    Atente às seguintes proposições a respeito de compostos orgânicos:


    I. Nos compostos orgânicos, os pontos de fusão e ebulição, em geral, são mais altos do que nas substâncias inorgânicas.

    II. Depois do carbono e do hidrogênio, o oxigênio é o elemento químico de maior presença nos compostos orgânicos.

    III. Na natureza, os ácidos carboxílicos estão presentes principalmente nos ésteres que constituem os óleos e as gorduras.

    IV. Atualmente o éter comum (etóxi-etano) é muito usado como solvente polar tanto em laboratório como nas indústrias químicas.


    Está correto o que se afirma somente em

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  • Ciências da Natureza

    Química

                         Imagem da questão de Química, UECE 2017, Chuva Ácida e Efeito Estufa

    As grandes emissões de dióxido de carbono são a causa principal do efeito estufa. Preocupados com esse grave problema, cientistas da Islândia estão trabalhando a conversão do referido gás em um material sólido. Para conseguir tal objetivo, o procedimento mais apropriado e utilizado em condições especiais de laboratório é
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