12.3 DNA Replication.

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12.3 DNA Replication

Copying DNA DNA separates into 2 strands – each serving as template for new strands Point at which DNA splits = Replication Fork Enzyme (helicase) breaks H bonds and untwists DNA Enzyme (DNA Polymerase) moves complementary nucleotides in place to bond properly

**mutations can occur – ex. Base left out or inserted Caused by mutagens (environmental agents that cause mutations) DNA Polymerase “proofreads”

Telomeres = DNA at tip of chromosome Enzyme (telomerase) add short segments of DNA so info is not lost