Multiple Choice
Which of the following enzymes proofreads the new DNA molecules during replication?
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14. DNA Synthesis
DNA Polymerases
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Which enzyme is responsible for adding nucleotides during DNA replication?
A
RNA polymerase
B
DNA polymerase
C
Ligase
D
Helicase
Verified step by step guidance1
Understand the process of DNA replication: DNA replication is the process by which a cell duplicates its DNA, creating two identical copies. This process is essential for cell division.
Identify the role of enzymes in DNA replication: Several enzymes are involved in DNA replication, each with a specific function. Key enzymes include helicase, DNA polymerase, and ligase.
Focus on the function of DNA polymerase: DNA polymerase is the enzyme responsible for adding nucleotides to the growing DNA strand. It reads the template strand and adds complementary nucleotides to synthesize the new strand.
Differentiate between the enzymes: RNA polymerase is involved in transcription, not DNA replication. Ligase is responsible for joining Okazaki fragments on the lagging strand. Helicase unwinds the DNA double helix.
Conclude that DNA polymerase is the enzyme responsible for adding nucleotides during DNA replication, as it synthesizes the new DNA strand by adding nucleotides complementary to the template strand.
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