Question

What is present before DNA replicates in the S phase?

1) DNA polymerase
2) DNA helicase
3) DNA ligase
4) DNA primase

Answer 1

DNA primase is present before DNA replicates in the S phase.

Step-by-step explanation:

The correct answer is 4) DNA primase. Before DNA replicates in the S phase, DNA primase is present. DNA primase synthesizes RNA primers complementary to the DNA strand, which serve as a starting point for DNA polymerase to add nucleotides and form a daughter strand.