Dna Replication

Question 1

Explain DNA replication (6)

Answer 1

Leading strand
1.double helix unwinds &hydrogen bonds unzip
2.primer added allowing DNA polymerase to bond
3.dna polymerase add free nucleotides
Lagging strand
4.primers added 1by1 as unwinds
5.dna nucleotides added forming fragments
6. Fragments joined by DNA ligand to form complete complementary strand

Question 2

What is required for DNA replication (6)

Answer 2

• DNA templates
• free DNA nucleotides
• primers - short complementary strand of DNA
• DNA polymerase -adds free nucleotides
• DNA ligase - joins fragments
• energy (ATP)