Section 3

DNA Replication

• DNA replication is the process by which DNA is copied in a cell before a cell divides.

• Replication begins with the separation of the DNA strands by helicases. Then, DNA polymerases form new strands by adding complementary nucleotides to each of the original strands.

• Each new DNA molecule is made of one strand of nucleotides from the original DNA molecule and one new strand.

• Changes in DNA are called mutations. Proofreading and repair prevent many replication errors.

Vocabulary

DNA replication (p. 200) helicase (p. 200)

replication fork (p. 200) DNA polymerase (p. 200)

semi-conservative mutation (p. 202) replication (p. 200)

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