California State University, Fullerton » Biology » Biology 251 - Genetics » Spring 2021

Question #1

In DNA replication, the DNA duplex is opened from the closed double-stranded form at the origin of replication by:

A. iniatior proteins.

B. DNA gyrase.

C. topoisomerases.

D. helicase.

E. single-strand binding proteins.

Question #2

Tension ahead of the replication fork is created by the action of:

A. DNA gyrase.

B. DNA polymerases.

C. toposisomerases.

D. helicases.

E. single-strand binding proteins.

Question #3

RNA polymerization can occur de novo, but DNA polymerization cannot and requires an existing nucleic acid strand paired to a the template to extend.

A. True

B. False

Question #4

In E. coli, both DNA polymerase I and DNA polymerase III have proofreading activity through their 3' to 5' exonuclease activity.

A. True

B. False

Question #5

In E. coli, DNA polymerase III can extend the leading strand continuously to the termination sites at the other side of the genome because of its:

A. speed.

B. processivity.

C. fidelity.

D. accuracy.