| A | B |
|---|
| Adenine | 1 of the four nitrogen-containing bases found in DNA nucleotides that pairs with Thymine |
| Base-paring rule | cytosine pairs with guanine & adenine pairs with thymine |
| Complementary base pair | are connected to each other by hydrogen bonds |
| Cytosine | 1 of the four nitrogen-containing bases found in DNA nucleotides that pairs with Guanine |
| Deoxyribose | a sugar molecule found in DNA nucleotides |
| DNA polymerase | enzyme that binds to the separated strands of DNA |
| Double helix | DNA is composed of 2 nucleotide strands that wrap around each other |
| Guanine | 1 of the four nitrogen-containing bases found in DNA nucleotides that pairs with Cytosine |
| Helicase | enzyme that seprates DNA strands before replication |
| Mutation | a change in DNA |
| Nitrogenous base | contains nitrogen and carbon atoms |
| Purine | organic molecule that has a double ring of carbon and nitrogen atoms |
| Pyrimidine | organic molecule that has a single ring of carbon and nitrogen atoms |
| Replication | process by which DNA copies itself during interphase |
| Replication fork | the points at which the DNA strands separate during replication |
| Thymine | 1 of the four nitrogen-containing bases found in DNA nucleotides that pairs with Adenine |
| Prokaryotic cell | single circular chromosome that replicates from a single point and proceeds in both directions |
| Eukaryotic cell | replication starts at many places on DNA molecule and proceeds in both directions |
