8.2 Study Guide

Question 1

Definition of a leading strand:

Answer 1

A new strand of DNA that can be added to continuously.

Question 2

Definition of a lagging strand:

Answer 2

Short fragments are made on the second strand.

Question 3

Definition of a semiconservative replication:

Answer 3

A DNA replication model where each of the two daughter molecules will have one old stand from the parental molecule and one newly-made strand.

Question 4

Definition of a okazaki fragments:

Answer 4

Portions of a lagging strand.

Question 5

Purpose of Helicase:

Answer 5

Separates the parental strand of DNA to start replication.

Question 6

Purpose of DNA Polymerase I:

Answer 6

Removes and replaces RNA primers with DNA

Question 7

Purpose of DNA Polymerase III:

Answer 7

Catalyzes the synthesis of new DNA by adding nucleotides to a preexisting chain.

Question 8

Purpose of Ligase:

Answer 8

Joins together DNA fragments

Question 9

Purpose of Primase:

Answer 9

Adding RNA primers so that the process can continue.

Question 10

Order of events in DNA replication:

Answer 10

1) DNA Strands are separated.
2) RNA primer is laid down.
3) DNA nucleotide bases are added.
4) RNA primer is replaced by DNA.
5) Okazaki fragments are glued together.