CLEP Biology DNA Structure and Replication 2

Question 1

Which enzyme is responsible for unwinding the DNA double helix during replication?

Accepted Answer

Helicase

Answer

DNA polymerase

Answer

Ligase

Answer

Primase

Question 2

What is the term for the short RNA sequences that initiate DNA synthesis?

Accepted Answer

Primers

Answer

Okazaki fragments

Answer

Telomeres

Answer

Exons

Question 3

The leading strand is synthesized continuously because it grows in the same direction as:

Accepted Answer

The replication fork movement

Answer

The lagging strand

Answer

The primer removal

Answer

The Okazaki fragment ligation

Question 4

Which of the following correctly describes the antiparallel nature of DNA?

Accepted Answer

One strand runs 5' to 3' while the complementary strand runs 3' to 5'

Answer

Both strands run 5' to 3' in the same direction

Answer

DNA strands run perpendicular to each other

Answer

The two strands have identical base sequences

Question 5

Chargaff's rules state that in any DNA molecule:

Accepted Answer

A + G = C + T

Answer

The amount of A equals C and the amount of G equals T

Answer

Purines always pair with purines

Answer

The ratio of A to T varies by species

Question 6

What does the enzyme DNA ligase do during replication?

Accepted Answer

Joins Okazaki fragments by forming phosphodiester bonds

Answer

Synthesizes new DNA strands

Answer

Removes RNA primers

Answer

Unwinds the double helix

Question 7

Which of the following is NOT a component of a DNA nucleotide?

Accepted Answer

Ribose sugar

Answer

Deoxyribose sugar

Answer

Phosphate group

Answer

Nitrogenous base