1. DNA Replication

2. Genes as Information Transfer A gene is the sequence of nucleotides within a portion of DNA that codes for a peptide or a functional RNA A gene is the sequence of nucleotides within a portion of DNA that codes for a peptide or a functional RNA Sum of all genes = genome Sum of all genes = genome

3. DNA Replication is Semiconservative Each strand of the parent DNA is used as a template to make the new daughter strand Each strand of the parent DNA is used as a template to make the new daughter strand DNA replication makes 2 new complete double helices each with 1 old and 1 new strand DNA replication makes 2 new complete double helices each with 1 old and 1 new strand

4. Steps in DNA Replication 1. 1. DNA helicase breaks the hydrogen bonds holding bases together. 2. 2. DNA polymerase adds new complementary nucleotides to each original strand from 5’ to 3’. 3. 3. Each new DNA molecule is identical to the parent DNA molecule and is composed of an original strand and a new strand.