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17TestBank - 60 As a ribosome translocates along an mRNA...

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60) As a ribosome translocates along an mRNA molecule by one codon, which of the following occurs? A) The tRNA that was in the A site moves into the P site. B) The tRNA that was in the P site moves into the A site. C) The tRNA that was in the P site moves to the E site and is released. D) The tRNA that was in the A site departs from the ribosome. E) Both A and C are correct. Answer: E Topic: Concept 17.4 Skill: Knowledge 61) Which of the following does not occur during the termination phase of translation? Topic: Concept 17.4 Skill: Knowledge 62) What are polyribosomes? Topic: Concept 17.4 Skill: Knowledge 63) What is one function of a signal peptide? Topic: Concept 17.4 Skill: Knowledge 64) When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by A) a specific characteristic of the ribosome itself, which distinguishes free ribosomes from bound ribosomes. B) a signal-recognition particle that brings ribosomes to a receptor protein in the ER membrane. C) moving through a specialized channel of the nucleus. D) a chemical signal given off by the ER. E) a signal sequence of RNA that precedes the start codon of the message. Answer: B Topic: Concept 17.4 Skill: Knowledge 1
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65) Which of the following is least related to the other items? Topic: Concept 17.4 Skill: Comprehension
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