| Date | November 2017 | Marks available | 2 | Reference code | 17N.3.hl.TZ0.13 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | 13 | Adapted from | N/A |
Question
The stability of DNA is due to interactions of its hydrophilic and hydrophobic components.
Outline the interactions of the phosphate groups in DNA with water and with surrounding proteins (histones).
Markscheme
Water:
hydrogen/H-bonds
OR
ion–dipole interactions
Proteins:
ionic bonds/interactions
OR
hydrogen/H-bonds
OR
ion–dipole interactions
Ignore “London/dispersion/vdW/dipole–dipole interactions” stated for water and/or proteins.
Examiners report
[N/A]
