Here are the answers to the review questions: 1. Deoxyribonucleic acid 2. James Watson and Francis Crick 3. A nucleotide is the basic subunit or building block of DNA. 4. 1. Phosphate group 2. Five carbon sugar (deoxyribose) 3. Nitrogen containing base 5. Purines, Pyrimidines 6. Purines, Pyrimidines 7. Adenine, Guanine, Thymine, Cytosine 8. Adenine, Guanine, Thymine, Cytosine 9. TTAACGGCT