DNA replication

Question 1

What is the method of DNA replication known as and why

Answer 1

Semi conservative replication because half of the original DNA molecule is (conserved) kept in each of the two new DNA molecules

Question 2

First step of DNA replication

Answer 2

1. The originals DNA molecule is unwounded by the enzyme DNA helicase

Question 3

Second step of DNA replication

Answer 3

2. Hydrogen bond between the bases are broken by the unwinding and this forms two single polynucleotide DNA strands

Question 4

Third step of DNA replication

Answer 4

3. Each single polynucleotide acts as a template of the formation of a new strand

Question 5

Forth step of DNA replication

Answer 5

4. Free nucleotides are attracted to the exposed DNA bases by complimentary base pairing

Question 6

Fifth step of DNA replication

Answer 6

5. The new nucleotides are joined together by the enzyme DNA polymerase which catalyses condensation reactions to form two new paired strands

Question 7

Sixth step

Answer 7

6. The originals strand and the new strand joined together through hydrogen bonding

Question 8

Two features of DNA structure which make DNA replication easier

Answer 8

Weak hydrogen bonds between bases which can be broken easily

Double stranded can be used as template / Complimentary base pairing used for template of new strand

Question 9

What direction does the DNA polymerase go from

Answer 9

5’ to 3’

Question 10

Further information about leading and lagging

Answer 10

Look in book because diagram heavy explanation (Remember though DNA pairs have opposite 5’ and 3’ directions )