Unit 2 Section 2.2 DNA Replication
- Created by: stephloupoole
- Created on: 23-04-14 19:08
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- DNA Replication
- Why Does DNA replicate
- DNA copies itself before cell division, so that each new cell has the full amount of DNA
- How is DNA replicated?
- A DNA molecule has a paired base structure which makes it easy for DNA to copy itself
- 1) the hydrogen bonds between the two polynucleotide DNA strands break. The Helix unzips to form two single strands
- 2) Each original single strand acts as a template for a new strand. free floatiing DNA nucleotides join to the exposed bases on each original template strand by complementary base pairing, A and T and C and G
- 3) the nucleotides on the new strand are joined together by the enzyme DNA polymerase. Hydrogen bonds form between the bases on the original and new strand
- Each new DNA molecule contains one strand from the original DNA molecule and one new strand
- A DNA molecule has a paired base structure which makes it easy for DNA to copy itself
- Why Does DNA replicate
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