Question

which enzyme is responsible for proofreading dna as it is built, ensuring the completed strand is as accurate as possible?
a. helicase
b. dna polymerase
c. dna ligase
d. rna primer

Explanation:

• Helicase: Unwinds the DNA double - helix, not for proofreading.
• DNA polymerase: Has a proof - reading function. It can check for incorrect base pairings as it synthesizes new DNA strands.
• DNA ligase: Joins Okazaki fragments on the lagging strand during DNA replication, not for proofreading.
• RNA primer: Provides a starting point for DNA synthesis (by DNA polymerase), not for proofreading.

Answer:

B. DNA polymerase