Answer:
The correct option is B. In a normal cell, 99% of the errors that occur during DNA replication are repaired by the exonuclease activity of DNA polymerase
Explanation:
DNA proofreading can be described as a method by which in which the DNA polymerases check and repair any errors they might have made during the replication of the DNA. The exonuclease activity of the DNA interprets whenever a wrong nucleotide has been placed and corrects it.
Without the method of proofreading, the DNA would undergo many errors during the process of replication which will lead to many faulty proteins being formed.
