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.

Answer: (B)

Verified step by step guidance

1. Understand the role of each enzyme listed in the options: Helicase, DNA polymerase, DNA ligase, and ATP synthase.
2. Recall that DNA replication involves the synthesis of a new DNA strand complementary to the template strand.
3. Identify the enzyme responsible for adding nucleotides to the growing DNA strand during replication.
4. Recognize that the enzyme must add nucleotides to the 3' end of the growing DNA strand, which is a key characteristic of DNA polymerase.
5. Conclude that DNA polymerase is the enzyme that catalyzes the elongation of new DNA by adding nucleotides complementary to the DNA template.