1. DNA Replication

2. When and why must the DNA molecule be copied? Before cell division the DNA must be copied so that any new cells will have an identical copy of the DNA from the original cell What is this called? Replication

3. DNA unwinds and unzips Step 1 helix unwinds and 2 DNA strands separate at the hydrogen bonds between nitrogen bases

4. DNA polymerase helps to link free floating DNA nucleotides Step 2 with complementary nucleotides on each of the two strands.

5. Covalent bonds join Step 3 nucleotides above and below each other on the new strands. Hydrogen bonds join complimentary base pairs

6. Each new DNA MOLECULE formed contains Step 4 One parent strand and one new strand

7. Mutation If an error is made during replication, what is it called?