Protein Synthesis – Section 1

16. The direction of amino acid transfer to the growing polypeptide chain is

A. from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
B. from the P site to the A site on the ribosome
C. from the A site to the E (exit tRNA site) site on the ribosome
D. from the P site to the E site on the ribosome

Correct Answer: B. from the P site to the A site on the ribosome

17. The pathway of a tRNA during polypeptide elongation on the ribosome is

A. A site → P site → E site
B. P site → entry site → exit site
C. A site → P site → entry site
D. P site → A site → E site

Correct Answer: A. A site → P site → E site

18. Which of the following has unusual bases?

A. mRNA
B. tRNA
C. rRNA
D. hnRNA

Correct Answer: B. tRNA

19. The site on a bacterial chromosome that marks the termination point for chromosome replication is called

A. ter
B. a stop codon.
C. a stem-loop
D. pau

Correct Answer: A. ter

20. Degenerated codon differs mostly in

A. the identities of their second base
B. the identities of their third base
C. the wobble position
D. both (b) and (c)

Correct Answer: D. both (b) and (c)

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