Week 6 Pre-Class Quiz

A point mutation that causes no change in the amino acid sequence of a protein is called a: A. synonymous (silent) mutation. B. nonsynonymous (missense) mutation. C. stop mutation. D. transition mutation. E. nonsense mutation.

A. synonymous (silent) mutation.

Which one of the following types of proteins interacts directly with a stop codon? A. transcription factor B. release factor C. elongation factor D. initiation factor E. sigma factor

B. release factor

Which of the following occurs in the A site of the ribosome during translation? A. None of the other answer options is correct. B. The tRNA carrying the growing polypeptide moves to this site as the ribosome slides to the next codon. C. An incoming charged tRNA binds to this site. D. An uncharged tRNA is ejected from this site as the ribosome slides to the next codon.

C. An incoming charged tRNA binds to this site.

The unfolding of a protein by heat or chemical treatment is referred to as: A. depolymerization. B. hydrolysis. C. denaturation. D. uncoupling. E. disaggregation.

C. denaturation.

Which of the following brings amino acids to the ribosome for use in translation? A. mRNA B. rRNA C. tRNA

C. tRNA

Which of the following occurs in the E site of the ribosome during translation? A. An incoming charged tRNA binds to this site. B. The tRNA carrying the growing polypeptide moves to this site as the ribosome slides to the next codon. C. None of the other answer options is correct. D. An uncharged tRNA is ejected from this site as the ribosome slides to the next codon.

D. An uncharged tRNA is ejected from this site as the ribosome slides to the next codon.

Which of the following occurs in the P site of the ribosome during translation? A. An uncharged tRNA is ejected from this site as the ribosome slides to the next codon. B. An incoming charged tRNA binds to this site. C. None of the other answer options is correct. D. The tRNA carrying the growing polypeptide moves to this site as the ribosome slides to the next codon.

D. The tRNA carrying the growing polypeptide moves to this site as the ribosome slides to the next codon.

A point mutation that creates a premature stop codon is called a _____ mutation. A. transition B. synonymous (silent) C. translation D. nonsense E. nonsynonymous (missense)

D. nonsense

Which one of the following can contribute to a protein's tertiary structure? A. covalent bonding B. hydrogen bonding C. van der Waal's forces D. ionic bonding E. All of the other answer options are correct.

E. All of the other answer options are correct.