AP BIOLOGY

Detailed explanation-1: -Primase synthesizes RNA primers complementary to the DNA strand. DNA polymerase III extends the primers, adding on to the 3’ end, to make the bulk of the new DNA. RNA primers are removed and replaced with DNA by DNA polymerase I.

Detailed explanation-2: -The central enzyme involved is DNA polymerase, which catalyzes the joining of deoxyribonucleoside 5′-triphosphates (dNTPs) to form the growing DNA chain.

Detailed explanation-3: -Primase is an enzyme that synthesizes short RNA sequences called primers. These primers serve as a starting point for DNA synthesis.

Detailed explanation-4: -So, the correct answer is ‘Ligase’.

Detailed explanation-5: -DNA polymerase is the enzyme that is responsible for adding nucleotides to form daughter strands. In the third phase of DNA replication, DNA polymerase is signaled by the RNA primer on the leading and lagging strands.