Q28 (b)

Criteria	Marks
Provides a description of DNA replication	3
Outlines some steps in DNA replication	2
Provides some relevant information	1

Sample answer:

An enzyme unzips the DNA, creating a replication fork. On each strand, an enzyme attaches to the original DNA nucleotides and uses them as a template. It ‘reads’ the bases, and adds complementary nucleotides. Another enzyme ‘glues’ the nucleotides together, forming a new, double stranded section of DNA.