A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2020 · Q221 Mark
Some viruses have single-stranded DNA as their genetic material. This DNA molecule has to be folded to fit in the protein coat. Which statements about single-stranded DNA are correct? 1 Single-stranded DNA cannot replicate semi-conservatively. 2 If only the percentage of cytosine is known, then the percentage of guanine can be calculated, but the percentage of adenine and thymine cannot be calculated. 3 Hydrogen bonds may be present within the DNA molecule.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct answer
C: 1 and 3 only
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