DNA replication

Question 1

Describe the process of DNA replication.

Answer 1

• The two strands of the DNA unwind and unzip exposing the bases.
• Each strand acts as a template for the synthesis of a new complementary strand.
• So in the each of the two new molecules of DNA produced, one strand is maintained/pre-existing and one strand is newly synthesised.

Question 2

Explain why the replication of a DNA molecule is termed semi-conservative.

Answer 2

• In the process of DNA replication, the two strands of the DNA separate and each strand is used as a template for the synthesis of a new complementary strand.
• So in the each of the two new molecules of DNA produced, one strand is maintained/pre-existing and one strand is newly synthesised.

Question 3

Explain why DNA needs to be replicated prior to cell division.

Answer 3

• To ensure that both daughter cells receive an identical copy of the DNA to the parent cell.