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? A) A termination codon causes the A site to accept a release factor. B) The newly formed polypeptide is released. C) A tRNA with the next amino acid enters the P site. D) The two ribosomal subunits separate. E) Translation stops. Answer: C Topic: Concept 17.4 Skill: Knowledge 62) What are polyribosomes? A) groups of ribosomes reading a single mRNA simultaneously B) ribosomes containing more than two subunits C) multiple copies of ribosomes associated with giant chromosomes D) aggregations of vesicles containing ribosomal RNA E) ribosomes associated with more than one tRNA Answer: A Topic: Concept 17.4 Skill: Knowledge 63) What is one function of a signal peptide? A) to direct an mRNA molecule into the cisternal space of the ER B) to bind RNA polymerase to DNA and initiate transcription C) to terminate translation of the messenger RNA D) to translocate polypeptides across the ER membrane E) to signal the initiation of transcription Answer: D 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? A) exons B) introns C) RNA splicing D) signal-recognition particles (SRPs) E) mRNA Answer: D Topic: Concept 17.4 Skill: Comprehension 66) Which of the following is not related to ribosomal activity? A) A site B) spliceosome C) codon recognition D) peptide bond formation E) P site Answer: B Topic: Concept 17.4 Skill: Comprehension 67) When does translation begin in prokaryotic cells? A) after a transcription initiation complex has been formed
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This note was uploaded on 11/16/2009 for the course SCIENCE 2412432 taught by Professor Burns during the Winter '04 term at American University of Science & Tech.

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

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