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Describe the events which take place during DNA replication. The first event is the unwinding of DNA's double helix structure, through DNA helicase breaking the hydrogen bonds between base pairs. The second event is the addition of free nucleotides to the exposed polynucleotide strand.What is the process in which DNA replication occurs?
Describe the process in which DNA replication occurs (6 marks) Firstly, the enzyme DNA helicase separates the two strands in DNA by breaking the hydrogen bonds between them. Both of the two strands then act as templates to which free nucleotides attach to.What is the question marking guidance for a-level Biology?
MARK SCHEME – A-LEVEL BIOLOGY – 7402/1 – JUNE 2018 9 Question Marking Guidance Mark Comments 03.3 1. 2 Must not harm the bees OR Must allow the bee to be released unchanged; 2. Must allow close examination OR Use a key (to identify the species); 2. Accept method that allows close examination 2.Ignore references to DNA sequencing 2.How does semi-conservative replication work?
The enzyme DNA polymerase then moves up the new strands, joining the nucleotides on them with phosphodiester bonds. The hydrogen bonds between bases reform, and the DNA has successfully replicated by semi-conservative replication.