| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.SL.TZ1.10 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 10 | Adapted from | N/A |
Question
What links the pairs of complementary bases in a DNA double helix?
A. Covalent bonds
B. Hydrogen bonds
C. Ionic bonds
D. Peptide bonds
Markscheme
B
Examiners report
N/A
Syllabus sections
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