4.2 Study Guide

Question 1

What is the order of DNA Replication? What is the in-depth order as well?

Answer 1

Helicase, Primase, DNA Polymerase III, DNA Polymerase I, and Ligase. The advanced order is: DNA is separated, RNA primer is laid down, DNA nucleotide bases are added, RNA primer is replaced by DNA, and okazaki fragments are glued together.

Question 2

What is the only direction is DNA made?

Answer 2

5’ to 3’, nucleotides are added to the 3’ ends.

Question 3

What are DNA strands? What does this mean for nucleotides?

Answer 3

DNA strands are antiparallel, that means nucleotides are added in opposite directions on the two parent strands.

Question 4

Which way is the leading strand going? Which was is the lagging strand going?

Answer 4

Towards the replication fork; away from the replication fork.

Question 5

How do they copy from leading to lagging?

Answer 5

Continuously; discontinuously.

Question 6

What is the difference of DNA Polymerase III and I?

Answer 6

III makes DNA and I edits, repairs, and removes primer.

Question 7

How often and many mistakes are there in DNA?

Answer 7

Mistakes are few but can still happen every time a cell divides.