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h t htt ps: https://bioexplica.com.br/ h t 01. (Unesp) Mortandade de peixes e coloração da água do Rio Tietê preocupam no interior de SP A água de cor estranha e o cheiro forte estão preocupando quem mora perto do rio. Pescadores estão voltando para casa com as redes vazias. “O que você está vendo são os peixes mortos. Mas não morrem só peixes, morre toda uma cadeia abaixo dos peixes, que são outros microrganismos, pequenos crustáceos, pequenos moluscos que são alimentos dos peixes”, explica o biólogo Arif Cais, professor voluntário aposentado da Unesp de São José do Rio Preto. (https://g1.globo.com, 11.05.2019. Adaptado.) A reportagem faz referência ao fenômeno de eutrofização. Nesse fenômeno, um dos eventos que precedem e um dos eventos que sucedem a mortandade dos peixes são, respectivamente: a) despejo de esgotos nas águas e decomposição aeróbica. b) proliferação de microrganismos aeróbicos e decomposição anaeróbica. c) redução da matéria orgânica disponível e mortandade de crustáceos e moluscos. d) turvação da água e redução da matéria orgânica disponível. e) produção de gás sulfídrico e proliferação de microrganismos aeróbicos. 02. (Unesp) Comportamento do casal pode definir sexo do bebê, dizem pesquisadores Muitas pessoas sonham não só com o nascimento de um bebê, mas com o sexo dele. Não é possível escolher se você vai gerar uma menina ou um menino, mas alguns pesquisadores sugerem que alguns fatores, como fazer https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br https://www.instagram.com/bioexplica/?hl=pt-br 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sexo exatamente no dia da ovulação, ou a frequência das relações sexuais, aumentariam a chance de ter uma criança de determinado sexo. (Ivonete Lucirio. https://universa.uol.com.br, 06.08.2012. Adaptado.) A notícia traz hipóteses ainda em discussão entre especialistas, mas o que o conhecimento biológico tem como certo é que, na espécie humana, o sexo da prole é definido no momento da fecundação e depende da constituição cromossômica do a) espermatozoide,que é definida na meiose I da gametogênese do pai e a mãe não tem participação na determinação do sexo da prole. b) óvulo, que é definida na meiose II da gametogênese da mãe e o pai não tem participação na determinação do sexo da prole. c) espermatozoide, que é definida na meiose II da gametogênese do pai e a mãe não tem participação na determinação do sexo da prole. d) óvulo e do espermatozoide, que são definidas na meiose II da gametogênese de ambos os genitores e o pai e a mãe participam, conjuntamente, da determinação do sexo da prole. e) óvulo, que é definida na meiose I da gametogênese da mãe e o pai não tem participação na determinação do sexo da prole. 03. (Unesp) Os microplásticos representam aproximadamente 92,4% da contagem global de partículas de lixo plástico. Estes pequenos plásticos de até 5 mm de tamanho estão entrando no ambiente marinho, contaminando um sistema já vulnerável. (www.arocha.org. Adaptado.) Os mexilhões estão entre os invertebrados marinhos diretamente afetados pela presença de partículas de microplásticos nas águas, uma vez que, para se alimentarem, a) capturam micropartículas batendo os flagelos dos coanócitos. b) raspam com a rádula a superfície do substrato marinho. c) trituram com dentes calcários outros animais menores. d) filtram partículas de alimento na água circundante. e) circulam a água pelos canais do sistema ambulacrário. 04. (Unesp) A resposta das células a pulsos elétricos sugere que a membrana plasmática assemelha-se a um circuito elétrico composto por uma associação paralela entre um resistor (R) e um capacitor (C) conectados a uma fonte eletromotriz (E). A composição por fosfolipídios e proteínas é que confere resistência elétrica à membrana, enquanto a propriedade de manter uma diferença de potencial elétrico, ou potencial de membrana, é comparável a um capacitor. https://bioexplica.com.br/ https://bioexplica.com.br/ https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m 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C. Garcia. Biofísica, 2002. Adaptado.) A figura mostra a analogia entre um circuito elétrico e a membrana plasmática. A diferença de potencial elétrico na membrana plasmática é mantida a) pelo bombeamento ativo de íonspromovido por proteínas de membrana específicas. b) pela difusão facilitada de íons através de proteínas canais que transpassam a membrana. c) pela constante difusão simples de íons por entre as moléculas de fosfolipídios. d) pela transferência de íons entre os meios extra e intracelular por processos de endocitose e exocitose. e) pelo fluxo de água do meio mais concentrado em íons para o meio menos concentrado. 05. (Unesp) A amônia 3(NH ) é obtida industrialmente pelo processo Haber- Bosch, que consiste na reação química entre o gás nitrogênio proveniente do ar e o gás hidrogênio. O processo ocorre em temperaturas superiores a 500 C e pressões maiores que 200 atm e pode ser representado pela equação química: 2(g) 2(g) 3(g)N H 2 NH A amônia produzida por esse processo tem como uma de suas aplicações a fabricação de fertilizantes para o aumento da produção agrícola. Na natureza, a amônia também é produzida tendo o ar como fonte de gás nitrogênio, que é assimilado a) pelo micélio dos fungos filamentosos. b) pela respiração dos animais invertebrados que vivem no solo. c) por bactérias no solo e nas raízes de leguminosas. d) pelo processo de fotossíntese realizado por plantas e algas. e) pela decomposição dos tecidos dos seres vivos. https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m 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https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://www.youtube.com/channel/UCiOxT6tBdPUj2VejYXp-_dA https://bioexplica.com.br/ https://bioexplica.com.br/ https://bioexplica.com.br/ h t h t htt ps: QUESTÃO 01 Gabarito: [B] No processo de eutrofização, um dos eventos que precedem a morte dos peixes é a intensa proliferação de microrganismos aeróbicos. Um dos que sucedem a mortandade dos peixes é a decomposição anaeróbica, devido ao aumento da DBO. QUESTÃO 02 Gabarito: [A] A determinação do sexo em mamíferos é do tipo XY, isto é, o macho é heterogamético, produzindo dois tipos de espermatozoides, com relação aos cromossomos sexuais: 50% com o cromossomo X e 50% com o Y. Z fêmea é homogamética, produzindo todos os ovócitos com o cromossomo X. Logo, o tipo de espermatozoide é que definirá o sexo do filhote. A segregação desses cromossomos ocorreudurante a meiose I paterna. QUESTÃO 03 Gabarito: [D] Os mexilhões são moluscos bivalves que se alimentam por filtração da água circundante. Por esse motivo, são bons indicadores de poluição aquática. QUESTÃO 04 Gabarito [A] A diferença de potencial elétrico na membrana plasmática é promovido por transporte ativo de íons pelas proteínas específicas dessa membrana. QUESTÃO 05 Gabarito: [C] A produção de amônia 3(NH ) a partir do nitrogênio atmosférica 2(N ) é realizado na natureza por bactérias no solo e nas raízes de plantas da família das leguminosas. https://bioexplica.com.br/ https://bioexplica.com.br/ https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m https://www.tiktok.com/@ramoskennedy?source=h5_m 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