Question

Which proteins are present at the eukaryotic replication fork?

a DNA polymerase III, DNA polymerase I, DnaB helicase, DnaB primase
b DNA polymerase gamma, DNA polymerase delta, DNA polymerase I, Mcm2-7 helicase, PCNA
c DNA polymerase alpha, DNA polymerase delta, DNA polymerase III, Mcm2-7 helicase, beta clamp
d DNA polymerase alpha primase, DNA polymerase delta, DNA polymerase epsilon, Mcm2-7 helicase, PCNA, and RCF-1

Answer 1

The proteins present at the eukaryotic replication fork include DNA polymerase alpha primase, DNA polymerase delta, DNA polymerase epsilon, Mcm2-7 helicase, PCNA, and RF-1, which work together to mediate DNA replication.

Step-by-step explanation:

The proteins present at the eukaryotic replication fork include DNA polymerase alpha primase, DNA polymerase delta, DNA polymerase epsilon, Mcm2-7 helicase, proliferating cell nuclear antigen (PCNA), and RF-1. DNA polymerase alpha primase initiates DNA synthesis by creating a primer with a short RNA sequence. DNA polymerase delta extends this primer, adding DNA nucleotides in a processive manner. DNA polymerase epsilon also participates in DNA synthesis. The Mcm2-7 complex is a helicase that unwinds the DNA, allowing replication to occur. PCNA acts as a sliding clamp to increase the processivity of DNA polymerase delta. RF-1 (replication factor C) is involved in the loading of PCNA onto DNA to stabilize the interaction between the polymerase and the template strand.