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
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
18. Which of the following has unusual bases?
A. mRNA
B. tRNA
C. rRNA
D. hnRNA
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
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)