Second Exam Graded

Question 1

T or F: 1. RNA polymerase from E. coli (core enzyme alone) can recognize specific start signals in DNA.

Answer 1

False; It recognize Promoter.

Question 2

T or F: The sigma factor of E. coli RNA polymerase: combines with the core enzyme to confer specific binding to a primer.

Answer 2

False; binding to a promoter

Question 3

The formation of a peptide bond between two amino acids is an example of a(n) ______________ reaction.

A) cleavage
B) condensation
C) group transfer
D) isomerization
E) oxidation reduction

Answer 3

B) condensation

Question 4

Which of the following are features of the wobble hypothesis?
A) A naturally occurring tRNA exists in yeast that can read both arginine and lysine codons.
B) A tRNA can recognize only one codon.
C) Some tRNAs can recognize codons that specify two different amino acids if both are nonpolar.
D) The “wobble” occurs only in the first base of the anticodon.
E) The “wobble” occurs only in the third base of the anticodon.

Answer 4

D) The “wobble” occurs only in the first base of the anticodon.

Question 5

Which of the following is not part of miRNA formation?
A) Pri-miRNA
B) Pre-miRNA
C) Dicer
D) RISC
E) Pseudouridine

Answer 5

E) Pseudouridine