Multiple Choice
The removal of the RNA primer and addition of DNA nucleotides to the 3' end of Okazaki fragments in its place is carried out by __________.
14. DNA Synthesis
Steps of DNA Replication
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During DNA replication, the enzyme ___________, catalyzes the elongation of new DNA by adding, to the 3' end of the previous nucleotide, new nucleotides that are complementary to a DNA template.
A
Helicase.
B
DNA polymerase.
C
DNA ligase.
D
ATP synthase.
Verified step by step guidance1
Understand the role of each enzyme listed in the options: Helicase unwinds the DNA double helix, DNA polymerase synthesizes new DNA strands, DNA ligase joins Okazaki fragments, and ATP synthase is involved in ATP production.
Identify the process described in the problem: The elongation of new DNA strands by adding nucleotides complementary to a DNA template during DNA replication.
Recall that during DNA replication, the enzyme responsible for adding nucleotides to the growing DNA strand is DNA polymerase.
Recognize that DNA polymerase adds nucleotides to the 3' end of the growing DNA strand, ensuring that the new strand is synthesized in the 5' to 3' direction.
Conclude that the enzyme described in the problem, which catalyzes the elongation of new DNA by adding nucleotides to the 3' end, is DNA polymerase.
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