| Front | Contrast the structures of DNA and mRNA molecules to give three differences. [3 marks] |
|---|---|
| Back | 1. DNA double stranded/double helix and mRNA single-stranded; 2. DNA (very) long and RNA short; 3. Thymine/T in DNA and uracil/U in RNA; 4. Deoxyribose in DNA and ribose in RNA; 5. DNA has base pairing and mRNA doesn't/ DNA has hydrogen bonding and mRNA doesn't; 6. DNA has introns/non-coding sequences and mRNA doesn't; |
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