| Date | May 2018 | Marks available | 2 | Reference code | 18M.3.hl.TZ1.19 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Describe | Question number | 19 | Adapted from | N/A |
Question
Radiotherapy is one type of treatment for cancer.
Describe how ionizing radiation destroys cancer cells.
[2]
a.
Outline how Targeted Alpha Therapy (TAT) is used for treating cancers that have spread throughout the body.
[2]
b.
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]
a.
Any two of:
radiation source delivered directly to «targeted» cancer cells
by a carrier drug/protein/antibody
several sites in body can be targeted «at same time»
[2 marks]
b.
Examiners report
[N/A]
a.
[N/A]
b.
