Biology, Eighth Edition (Raven)

Chapter 14: DNA: The Genetic Material

DNA Replication Fork

View the animation below, then complete the quiz to test your knowledge of the concept.



1.

The enzyme that unwinds a segment of the DNA molecule is...
A)DNA polymerase.
B)DNA ligase.
C)RNA primase.
D)DNA polymerase III.
E)helicase.
2.

The enzyme that travels along the leading strand assembling new nucleotides on a growing new strand of DNA is...
A)DNA polymerase.
B)DNA ligase.
C)RNA primase.
D)DNA polymerase III.
E)helicase.
3.

Before the lagging strand can begin assembling new DNA nucleotides, which of the following must occur?
A)DNA polymerase III adds deoxyribonucleotides.
B)DNA polymerase I removes some material and replaces it with DNA.
C)OH bonds must be broken between the two strands of DNA.
D)DNA ligase forms a phosphodiester bond between the 3' OH of the growing strand and the 5' phosphate in front of it.
E)RNA primase constructs a short RNA primer.
4.

During DNA replication, the lagging strand is synthesized continuously, while the leading strand is synthesized discontinuously.
A)True
B)False
5.

Before DNA replication can occur, the OH bonds between the strands must be broken.
A)True
B)False
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