3.4 DNA replication summary of past mark schemes

[Pages:1]3.4 DNA replication ? summary of past mark schemes

3.4.1 Explain DNA replication in terms of unwinding the double helix and separation of the strands by helicase, followed by formation of the new complementary strands by DNA polymerase.

Mark Scheme

A. helix is unwound; B. two strands are separated; C. helicase (is the enzyme that unwinds the helix separating the two strands); D. by breaking hydrogen bonds between bases; E. new strands formed on each of the two single strands; F. nucleotides added to form new strands; G. complementary base pairing; H. A to T and G to C; I. DNA polymerase forms the new complementary strands; J. replication is semi-conservative; K. each of the DNA molecules formed has one old and one new strand;

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