| A | B | 
|---|
| nucleotide | monomer of a nucleic acid | 
| parts of a nucleotide | 5-C sugar, phosphate and nitrogenous base | 
| deoxyribose | sugar of DNA | 
| DNA | deoxyribonucleic acid | 
| RNA | ribonucleic acid | 
| bond between nitrogenous bases | hydrogen | 
| bond between amino acids | peptide | 
| 5-C sugar of RNA | ribose | 
| purine | nitrogenous base with two fused carbon rings | 
| pyrimidine | nitrogenous base with a single fused ring | 
| adenine | thymine | 
| guanine | cytosine | 
| nitrogenous base of RNA | uracil | 
| James Watson | Francis Crick | 
| DNA helicase | enzyme that straightens and unzips DNA | 
| DNA polymerase | enzyme that directs the synthesis of a new DNA strand | 
| RNA polymerase | main enzyme of transcription | 
| DNA ligase | enzyme that "glues" DNA segments together | 
| the process that converts the nucleotide sequence of mRNA into an amino acid sequence | translation | 
| genetic code | code that correlates nucleotide sequence and amino acid sequence |