1661. What is the name of a mutation that changes the reading frame of an RNA molecule?
A. Frameshift mutation *
B. Missense mutation
C. Nonsense mutation
D. change-frame mutation
1662. The 3 ends of a tRNA molecule contain which of the following sequences?
A. TATA
B. CAA *
C. AUG
D. UAA
1663. What is the enzyme responsible for stitching together Okazaki fragments?
A. Helicase
B. Single-stranded binding protein
C. Primase
D. Ligase *
1664. How many base pairs make up a codon?
A. 1
B. 2
C. 3 *
D. 4
1665. How many amino acids are there?
A. 20 *
B. 30
C. 40
D. 50
1666. What is the name of the proteins that catalyze the release of the peptide chain at translation termination?
A. Terminators
B. Releasors
C. RHO
D. Release factors *
1667. How many hydrogen bonds are formed between one A: T base pair?
A. 1
B. 2 *
C. 3
D. 4
1668. What is the name of the enzyme responsible for unwinding helical DNA for replication?
A. Helicase *
B. Polymerase
C. Ligase
D. Exonuclease
1669. Which of the following is not involved in the splicing reaction?
A. 5′ splice site
B. Hairpin loops *
C. Branch A point
D. 3′ splice site
1670. Between which phosphate groups is the linkage between the GTP molecule and RNA chain in the 5′ cap?
A. Beta-beta
B. Alpha-Gamma
C. Gamma-Beta
D. AlphA-Beta