DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ1.19a
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.hl.TZ1.19a |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
18M.3.hl.TZ1.19a
Radiotherapy is one type of treatment for cancer.
(a)
Describe how ionizing radiation destroys cancer cells.
[2]
Markscheme
Any two of:
radiation causes breaks in DNA chains
OR
radiation causes errors in DNA sequences
«damage accumulates and» cells cannot multiply
rapidly dividing/cancer cells more susceptible
Accept “alters DNA”.
[2 marks]
