= DNA Nucleotide Phosphate Nitrogen Base Pairs: Deoxyribose Phosphate Nitrogen Base Nitrogen Base Pairs: Adenine pairs with Thymine Guanine pairs with Cytosine

Base Pairing Rule Adenine pairs with Thymine Guanine pairs with Cytosine The order of nitrogen bases along a gene forms a genetic code that specifies what protein is produced

DNA Replication DNA nucleotides attach to each strand DNA strands separate DNA nucleotides attach to each strand

Each new DNA molecule will be an exact copy of the original

First, DNA strands separate by an enzyme called DNA helicase

Second, An enzyme called DNA Polymerase adds complementary bases to “single stranded” - A with T - C with G

Third, DNA nucleotides are attached to DNA strand

Fourth and final, the RNA is removed