segunda-feira, 8 de setembro de 2008

Questões - Citologia

01 - (PUC-RJ/2008) Qual das características abaixo NÃO está presente nas células vegetais?
(A) Parede celulósica.
(B) Mitocôndrias.
(C) Núcleo individualizado.
(D) Vacúolo.
(E) Centríolos.
02 - (UNIFESP/2008) Com a finalidade de bloquear certas funções celulares, um pesquisador utilizou alguns antibióticos em uma cultura de células de camundongo. Entre os antibióticos usados, a tetraciclina atua diretamente na síntese de proteína, a mitomicina inibe a ação das polimerases do DNA e a estreptomicina introduz erros na leitura dos códons do RNA mensageiro. Esses antibióticos atuam, respectivamente, no:
(A) ribossomo, ribossomo, núcleo.
(B) ribossomo, núcleo, ribossomo.
(C) núcleo, ribossomo, ribossomo.
(D) ribossomo, núcleo, núcleo.
(E) núcleo, núcleo, ribossomo.
03 - (UEM/ Verão/2008) – Assinale a alternativa que indica corretamente a estrutura celular e sua função.
A) O complexo de Golgi realiza a secreção celular, processo de síntese de proteínas.
B) A parede celular, constituída por proteínas e por celulose, delimita o espaço interno das células de todos os organismos.
C) Nas mitocôndrias, ocorre a liberação de energia nos processos de respiração celular e de fermentação.
D) A membrana plasmática, constituída por fosfolipídios e proteínas, controla a passagem de substâncias.E) O citoesqueleto, constituído por tubos e por filamentos protéicos, determina a rigidez celular.
04 - (UFPA/2008) Embora a diversidade dos seres vivos seja extremamente grande, quase todos (exceto os vírus) são constituídos por células. As células dos organismos vivos são muito parecidas, mas apresentam diferenças importantes; por exemplo, a célula vegetal diferencia-se da animal por apresentar as seguintes estruturas celulares:
(A) membrana celulósica e lisossomos.
(B) membrana plasmática e.centríolos.
(C) membrana nuclear e mitocôndrias.
(D) membrana celulósica e cloroplastos.
(E) membrana nucelar e lisossomos.
05 - (UFMT/ 2008) Mitocôndrias são organelas presentes nas células eucarióticas cuja principal função é:
A) digestão celular
B) respiração celular
C) secreção de proteínas
D) transporte de nutrientes
E) orientação da divisão celular

Obs: para melhor resolução dos exercícios o gabarito está nos comentários... vá até ali confira o gabarito e deixe seu recado...

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