Questões de quã­mica - FUVEST | Gabarito e resoluções

(FUVEST - 2001 - 1a fase) It is a nice irony, given that scientific genetics started with the manipulation of a crop plant, the pea, that the most vehement public opposition to it in recent years has come from those who object to the genetic manipulation of crops. At the moment, so-called genetically modified (GM) crops are in disgrace. Consumers, particularly in Europe, are wary of buying food that may contain them. Environmental activists are ripping up fields where they are being tested experimentally. And companies that design them are selling off their GM subsidiaries, or even themselves, to anyone willing to take on the risk. Yet the chances are that this is just a passing fad. No trial has shown a health risk from a commercially approved GM crop (or, more correctly, a transgenic crop, as all crop plants have been genetically modified by selective breeding since time immemorial). And while the environmental risks, such as cross-pollination with wild species and the promotion of insecticide-resistant strains of pest, look more plausible, they also look no worse than the sorts of environmental havoc wreaked by more traditional sorts of agriculture. THE ECONOMIST JULY 1ST 2000 The passage tells us that

(FUVEST - 2001 - 1a fase) A introduo de uma cpia de um gene humano no genoma do proncleo masculino de um zigoto originou uma ovelha transgnica. Se essa ovelha for cruzada com um macho no-transgnico, que porcentagem de descendentes portadores do gene humano espera-se obter?

(FUVEST - 2001 - 1a fase) It is a nice irony, given that scientific genetics started with the manipulation of a crop plant, the pea, that the most vehement public opposition to it in recent years has come from those who object to the genetic manipulation of crops. At the moment, so-called genetically modified (GM) crops are in disgrace. Consumers, particularly in Europe, are wary of buying food that may contain them. Environmental activists are ripping up fields where they are being tested experimentally. And companies that design them are selling off their GM subsidiaries, or even themselves, to anyone willing to take on the risk. Yet the chances are that this is just a passing fad. No trial has shown a health risk from a commercially approved GM crop (or, more correctly, a transgenic crop, as all crop plants have been genetically modified by selective breeding since time immemorial). And while the environmental risks, such as cross-pollination with wild species and the promotion of insecticide-resistant strains of pest, look more plausible, they also look no worse than the sorts of environmental havoc wreaked by more traditional sorts of agriculture. THE ECONOMIST JULY 1ST 2000 According to the passage, more traditional sorts of agriculture

(FUVEST - 2001 - 1a fase) O daltonismo causado por um alelo recessivo de um gene localizado no cromossomo X. Em uma amostra representativa da populao, entre 1000 homens analisados, 90 so daltnicos. Qual a porcentagem esperada de mulheres daltnicas nessa populao?

(FUVEST - 2001 - 1a fase) MICHAEL D. COES Breaking the Maya Code. Revised paperback edition. First published 1992. Thames Hudson, New York, 1999 ($18.95). The decipherment of the Maya script was, Coe states, one of the most exciting intellectual adventures of our age, on a par with the exploration of space and the discovery of the genetic code. He presents the story eloquently and in detail, with many illustrations of the mysterious Maya inscriptions and the people who tried to decipher them. Most of the credit, he says, goes to the late Yuri V. Knorosov of the Russian Institute of Ethnography, but many others participated. They did not always agree, and some of them went up blind alleys. Coe----- emeritus professor of anthropology at Yale University----- vividly describes the battles, missteps and successes. What is now established, he writes, is that the Maya writing system is a mix of logograms and syllabic signs; with the latter, they could and often did write words purely phonetically. SCIENTIFIC AMERICAN APRIL 2000 The passage tells us that Michael D. Coe

(FUVEST - 2001 - 1a fase) A vinblastina um quimioterpico usado no tratamento de pacientes com cncer. Sabendo-se que essa substncia impede a formao de microtbulos, pode-se concluir que sua interferncia no processo de multiplicao celular ocorre na

(FUVEST - 2001 -1a fase) Um pesquisador estudou uma clula ao microscpio eletrnico, verificando a ausncia de ncleo e de compartimentos membranosos. Com base nessas observaes, ele concluiu que a clula pertence a:

(FUVEST - 2001 - 1a fase) MICHAEL D. COES Breaking the Maya Code. Revised paperback edition. First published 1992. Thames Hudson, New York, 1999 ($18.95). The decipherment of the Maya script was, Coe states, one of the most exciting intellectual adventures of our age, on a par with the exploration of space and the discovery of the genetic code. He presents the story eloquently and in detail, with many illustrations of the mysterious Maya inscriptions and the people who tried to decipher them. Most of the credit, he says, goes to the late Yuri V. Knorosov of the Russian Institute of Ethnography, but many others participated. They did not always agree, and some of them went up blind alleys. Coe----- emeritus professor of anthropology at Yale University----- vividly describes the battles, missteps and successes. What is now established, he writes, is that the Maya writing system is a mix of logograms and syllabic signs; with the latter, they could and often did write words purely phonetically. SCIENTIFIC AMERICAN APRIL 2000 In the passage, some of them went up blind alleysmeans that some scientists engaged in the decipherment of the Maya script

(FUVEST - 2001 - 1a fase) MICHAEL D. COES Breaking the Maya Code. Revised paperback edition. First published 1992. Thames Hudson, New York, 1999 ($18.95). The decipherment of the Maya script was, Coe states, one of the most exciting intellectual adventures of our age, on a par with the exploration of space and the discovery of the genetic code. He presents the story eloquently and in detail, with many illustrations of the mysterious Maya inscriptions and the people who tried to decipher them. Most of the credit, he says, goes to the late Yuri V. Knorosov of the Russian Institute of Ethnography, but many others participated. They did not always agree, and some of them went up blind alleys. Coe----- emeritus professor of anthropology at Yale University----- vividly describes the battles, missteps and successes. What is now established, he writes, is that the Maya writing system is a mix of logograms and syllabic signs; with the latter, they could and often did write words purely phonetically. SCIENTIFIC AMERICAN APRIL 2000 According to the passage, Michael D. Coes book

(FUVEST - 2001 - 1a fase) Clulas animais, quando privadas de alimento, passam a degradar partes de si mesmas como fonte de matria-prima para sobreviver. A organela citoplasmtica diretamente responsvel por essa degradao

(FUVEST - 2001 - 1a fase) MICHAEL D. COES Breaking the Maya Code. Revised paperback edition. First published 1992. Thames Hudson, New York, 1999 ($18.95). The decipherment of the Maya script was, Coe states, one of the most exciting intellectual adventures of our age, on a par with the exploration of space and the discovery of the genetic code. He presents the story eloquently and in detail, with many illustrations of the mysterious Maya inscriptions and the people who tried to decipher them. Most of the credit, he says, goes to the late Yuri V. Knorosov of the Russian Institute of Ethnography, but many others participated. They did not always agree, and some of them went up blind alleys. Coe----- emeritus professor of anthropology at Yale University----- vividly describes the battles, missteps and successes. What is now established, he writes, is that the Maya writing system is a mix of logograms and syllabic signs; with the latter, they could and often did write words purely phonetically. SCIENTIFIC AMERICAN APRIL 2000 Which of these statements is true according to the passage?

(FUVEST - 2001 - 1a fase) Para a ocorrncia de osmose, necessrio que

(FUVEST - 2001 - 1a fase) Os vrtices de um tringulo ABC, no plano cartesiano, so: A = (1,0) , B = (0,1), C = (0, ) . Ento, o ngulo BCmede:

(FUVEST - 2001 - 1a fase) Dois espelhos planos, sendo um deles mantido na horizontal, formam entre si um ngulo . Uma pessoa observa-se atravs do espelho inclinado, mantendo seu olhar na direo horizontal. Para que ela veja a imagem de seus olhos, e os raios retornem pela mesma trajetria que incidiram, aps reflexes nos dois espelhos (com apenas uma reflexo no espelho horizontal), necessrio que o ngulo seja de

(FUVEST - 2001 - 1a fase) Uma pessoa segura uma lente delgada junto a umlivro, mantendo seus olhos aproximadamente a 40 cm da pgina, obtendoa imagem indicada na figura. Em seguida, sem mover a cabea ou o livro, vai aproximando a lente deseus olhos. A imagem, formada pela lente, passar a ser: