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Use os filtros para chegar às questões que interessam. Cada resultado abre em uma página própria com enunciado, alternativas e gabarito.
O quadro abaixo apresenta, na primeira coluna, tipos de interações entre populações de uma comunidade; na segunda, exemplos dessas interações; e, na terceira, alguns organismos que ilustram os exemplos.
Assinale a alternativa que substitui adequadamente a sequência de números do quadro.
Texto 1
US President Donald Trump has defended his use of social media in a series of tweets, following a row over comments he made about two MSNBC TV presenters.
"My use of social media is not presidential – it's modern day presidential," he tweeted on Saturday.
His tweets are condemned by Democrats and Republicans alike, despite the White House springing to his defence.
Mr Trump's aides have previously expressed concern over his tweets.
But the president said on Saturday that social media gave him the opportunity to connect directly to the public, bypassing the mainstream media, whose content Mr Trump regularly labels as "fake news".
"The FAKE & FRAUDULENT NEWS MEDIA is working hard to convince Republicans and others I should not use social media," he tweeted, adding: "But remember, I won the 2016 election with interviews, speeches and social media."
Mr Trump also stepped up his attack on CNN after the US news network retracted an article alleging that one of the president's aides was under investigation by Congress.
"I am extremely pleased to see that @CNN has finally been exposed as #FakeNews and garbage journalism. It's about time!"
The story that caused the upset, which was later removed from the website following an internal investigation, resulted in the resignations of three CNN journalists: Thomas Frank, investigative unit editor and Pulitzer Prize winner Eric Lictblau and Lex Harris, who oversaw the investigations unit.
Disponível em: http://www.bbc.com/news/world-us-canada-40471536.
O processo de formação dos gametas femininos é chamado ovulogênese e tem início antes do nascimento da mulher, apesar de alguns cientistas acreditarem que gametas femininos podem se originar na vida adulta, diretamente de células-tronco presentes no organismo. Neste processo as ovogônias dão origem aos ovócitos I, que estacionam na prófase I da meiose até a puberdade, quando por sua vez darão origem aos ovócitos II, e finalmente ao óvulo, se houver fecundação.
Considerando o número diploide de 46 cromossomos para a espécie humana e uma quantidade de DNA na interfase que pode ser representado por x de DNA, quantos cromossomos e que quantidade de DNA espera-se encontrar nas ovogônias e nos ovócitos II, respectivamente?
Texto 2
Em experimento bastante reproduzido em vídeos na internet, é possível mostrar que uma lata contendo refrigerante normal afunda em um balde com água, ao passo que uma lata de refrigerante dietético flutua.
Assinale a alternativa que preenche corretamente as lacunas do enunciado abaixo, na ordem em que aparecem.
A propriedade física a que se deve esse comportamento é a ........ e pode ser explicada pela ........ .
Durante o desenvolvimento embrionário de répteis, aves e mamíferos, formam-se estruturas associadas ao corpo do embrião denominadas anexos embrionários.
A respeito desses anexos, associe a coluna da direita com a esquerda.
Assinale a alternativa correta.
Texto 3
Dinner and a movie. A walk in a park after a picnic for two. They might not be original, but these are classic date ideas.
Do people your age go out on dates? Or are you more likely to hang out with a big group of people that includes people who are seeing each other exclusively?
In "The End of Courtship?" Alex Williams writes about Shani Silver, who recently waited to hear from the guy who had asked her on a "date" that evening: at 10 p.m., he texted to ask if she wanted to join him and "a bunch of friends from college" at the place where they were hanging out:
Turned off, she fired back a text message, politely declining. But in retrospect, she might have adjusted her expectations. "The word 'date‘ should almost be stricken from the dictionary," Ms. Silver said. "Dating culture has evolved to a cycle of text messages, each one requiring the code-breaking skills of a cold war spy to interpret."
"It‘s one step below a date, and one step above a high-five," she added. Dinner at a romantic new bistro? Forget it. Women in their 20s these days are lucky to get a last-minute text to tag along. Raised in the age of so-called "hookup culture," millennials — who are reaching an age where they are starting to think about settling down — are subverting the rules of courtship.
Instead of dinner and a movie, which seems as obsolete as a rotary phone, they rendezvous over phone texts, Facebook posts, instant messages and other "non-dates" that are leaving a generation confused about how to land a boyfriend or girlfriend.
"The new date is 'hanging out,' " said Denise Hewett, 24, an associate television producer in Manhattan, who is currently developing a show about this frustrating new romantic landscape. As one male friend recently told her: "I don‘t like to take girls out. I like to have them join in on what I‘m doing — going to an event, a concert."
(…) Relationship experts point to technology as another factor in the upending of dating culture.
Traditional courtship — picking up the telephone and asking someone on a date — required courage, strategic planning and a considerable investment of ego (by telephone, rejection stings). Not so with texting, e-mail, Twitter or other forms of "asynchronous communication," as techies call it. In the context of dating, it removes much of the need for charm; it‘s more like dropping a line in the water and hoping for a nibble.
"I‘ve seen men put more effort into finding a movie to watch on Netflix Instant than composing a coherent message to ask a woman out," said Anna Goldfarb, 34, an author and blogger in Moorestown, N.J. A typical, annoying query is the last-minute: "Is anything fun going on tonight?" (…)
BY SHANNON DOYNE Disponível em: https://mobile.nytimes.com/blogs/learning/2013/01/14/ is-the-date-a-thing-of-the-past/? Adaptado.
Observe o gráfico abaixo, referente à pressão de vapor de dois líquidos, A e B, em função da temperatura.
Considere as afirmações abaixo, sobre o gráfico.
I - O líquido B é mais volátil que o líquido A.
II - A temperatura de ebulição de B, a uma dada pressão, será maior que a de A.
III- Um recipiente contendo somente o líquido A em equilíbrio com o seu vapor terá mais moléculas na fase vapor que o mesmo recipiente contendo somente o líquido B em equilíbrio com seu vapor, na mesma temperatura.
Quais estão corretas?
A membrana plasmática é um envoltório celular que delimita o espaço interno da célula.
Quanto às suas propriedades e funções é correto afirmar, exceto:
Considere as seguintes afirmações a respeito do experimento de Rutherford e do modelo atômico de Rutherford-Bohr.
I - A maior parte do volume do átomo é constituída pelo núcleo denso e positivo.
II - Os elétrons movimentam-se em órbitas estacionárias ao redor do núcleo.
III- O elétron, ao pular de uma órbita mais externa para uma mais interna, emite uma quantidade de energia bem definida.
Quais estão corretas?
Texto 3
Dinner and a movie. A walk in a park after a picnic for two. They might not be original, but these are classic date ideas.
Do people your age go out on dates? Or are you more likely to hang out with a big group of people that includes people who are seeing each other exclusively?
In "The End of Courtship?" Alex Williams writes about Shani Silver, who recently waited to hear from the guy who had asked her on a "date" that evening: at 10 p.m., he texted to ask if she wanted to join him and "a bunch of friends from college" at the place where they were hanging out:
Turned off, she fired back a text message, politely declining. But in retrospect, she might have adjusted her expectations. "The word 'date‘ should almost be stricken from the dictionary," Ms. Silver said. "Dating culture has evolved to a cycle of text messages, each one requiring the code-breaking skills of a cold war spy to interpret."
"It‘s one step below a date, and one step above a high-five," she added. Dinner at a romantic new bistro? Forget it. Women in their 20s these days are lucky to get a last-minute text to tag along. Raised in the age of so-called "hookup culture," millennials — who are reaching an age where they are starting to think about settling down — are subverting the rules of courtship.
Instead of dinner and a movie, which seems as obsolete as a rotary phone, they rendezvous over phone texts, Facebook posts, instant messages and other "non-dates" that are leaving a generation confused about how to land a boyfriend or girlfriend.
"The new date is 'hanging out,' " said Denise Hewett, 24, an associate television producer in Manhattan, who is currently developing a show about this frustrating new romantic landscape. As one male friend recently told her: "I don‘t like to take girls out. I like to have them join in on what I‘m doing — going to an event, a concert."
(…) Relationship experts point to technology as another factor in the upending of dating culture.
Traditional courtship — picking up the telephone and asking someone on a date — required courage, strategic planning and a considerable investment of ego (by telephone, rejection stings). Not so with texting, e-mail, Twitter or other forms of "asynchronous communication," as techies call it. In the context of dating, it removes much of the need for charm; it‘s more like dropping a line in the water and hoping for a nibble.
"I‘ve seen men put more effort into finding a movie to watch on Netflix Instant than composing a coherent message to ask a woman out," said Anna Goldfarb, 34, an author and blogger in Moorestown, N.J. A typical, annoying query is the last-minute: "Is anything fun going on tonight?" (…)
BY SHANNON DOYNE Disponível em: https://mobile.nytimes.com/blogs/learning/2013/01/14/ is-the-date-a-thing-of-the-past/? Adaptado.
Na coluna da direita, estão listados cinco elementos da tabela periódica; na da esquerda, a classificação desses elementos.
Associe a coluna da direita à da esquerda.
( ) Alcalino
( ) Halogênio
( ) Alcalino terroso
( ) Elemento de transição
1 - Magnésio
2 - Potássio
3 - Paládio
4 - Bromo
5 - Xenônio
A sequência correta de preenchimento dos parênteses, de cima para baixo, é
Texto 3
Dinner and a movie. A walk in a park after a picnic for two. They might not be original, but these are classic date ideas.
Do people your age go out on dates? Or are you more likely to hang out with a big group of people that includes people who are seeing each other exclusively?
In "The End of Courtship?" Alex Williams writes about Shani Silver, who recently waited to hear from the guy who had asked her on a "date" that evening: at 10 p.m., he texted to ask if she wanted to join him and "a bunch of friends from college" at the place where they were hanging out:
Turned off, she fired back a text message, politely declining. But in retrospect, she might have adjusted her expectations. "The word 'date‘ should almost be stricken from the dictionary," Ms. Silver said. "Dating culture has evolved to a cycle of text messages, each one requiring the code-breaking skills of a cold war spy to interpret."
"It‘s one step below a date, and one step above a high-five," she added. Dinner at a romantic new bistro? Forget it. Women in their 20s these days are lucky to get a last-minute text to tag along. Raised in the age of so-called "hookup culture," millennials — who are reaching an age where they are starting to think about settling down — are subverting the rules of courtship.
Instead of dinner and a movie, which seems as obsolete as a rotary phone, they rendezvous over phone texts, Facebook posts, instant messages and other "non-dates" that are leaving a generation confused about how to land a boyfriend or girlfriend.
"The new date is 'hanging out,' " said Denise Hewett, 24, an associate television producer in Manhattan, who is currently developing a show about this frustrating new romantic landscape. As one male friend recently told her: "I don‘t like to take girls out. I like to have them join in on what I‘m doing — going to an event, a concert."
(…) Relationship experts point to technology as another factor in the upending of dating culture.
Traditional courtship — picking up the telephone and asking someone on a date — required courage, strategic planning and a considerable investment of ego (by telephone, rejection stings). Not so with texting, e-mail, Twitter or other forms of "asynchronous communication," as techies call it. In the context of dating, it removes much of the need for charm; it‘s more like dropping a line in the water and hoping for a nibble.
"I‘ve seen men put more effort into finding a movie to watch on Netflix Instant than composing a coherent message to ask a woman out," said Anna Goldfarb, 34, an author and blogger in Moorestown, N.J. A typical, annoying query is the last-minute: "Is anything fun going on tonight?" (…)
BY SHANNON DOYNE Disponível em: https://mobile.nytimes.com/blogs/learning/2013/01/14/ is-the-date-a-thing-of-the-past/? Adaptado.
Observe o parágrafo 4: “Instead of dinner and a movie, which seems as obsolete as a rotary phone, they rendezvous over phone texts, Facebook posts, instant messages and other “non-dates” that are leaving a generation confused about how to land a boyfriend or girlfriend.”
As partes sublinhadas contêm, respectivamente,
O processo de surgimento de uma nova espécie, denominado especiação, se completa com o surgimento do isolamento reprodutivo, que impede a indivíduos de espécies diferentes trocar genes por cruzamento.
Analise as afirmações a seguir.
l Isolamento sazonal: os membros de duas espécies não se cruzam porque seus períodos de reprodução não coincidem.
ll Isolamento mecânico: decorre da incompatibilidade entre os órgãos genitais dos membros de duas espécies.
lll Esterilidade do híbrido: os membros de duas espécies copulam, mas o híbrido formado é estéril.
Qual(is) da(s) afirmação(ões) acima contém mecanismos pós-zigóticos de isolamento reprodutivo
