3.1.5.2-DNA replication

Question 1

By what process does DNA replication occur?

Answer 1

Semi-conservative replication

Question 2

When does DNA replication occur?

Answer 2

In interphase before division by mitosis or meiosis

Question 3

What is the role of DNA polymerase in DNA replication?

Answer 3

Catalyses the joining together of adjacent nucleotides

Question 4

Describe the process of semi-conservative replication

Answer 4

-DNA helicase unwinds double helix
-Both strands act as templates
-Free DNA nucleotides line up in their complementary base pairs
-DNA polymerase joins adjacent nucleotides forming phosphodiester bonds
-Each new DNA molecule consists of one original strand and one new strand

Question 5

What is the role of DNA helicase in DNA replication?

Answer 5

Unwinds DNA and breaks hydrogen bonds between bases

Question 6

Why is DNA helicase important in DNA replication?

Answer 6

Breaks hydrogen bonds so strands can act as templates