DP Biology (last assessment 2024)
Question 17N.2.SL.TZ0.02b
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.2.SL.TZ0.02b |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
17N.2.SL.TZ0.02b
The figure shows a transmission electron micrograph of rotavirus particles. Each rotavirus is about 70 nanometres in diameter.
[Source: CDC / Dr. Erskine L. Palmer]
(b)
Rotavirus causes diarrhea and vomiting. Explain why viral diseases cannot be treated using antibiotics.
[2]
Markscheme
a. viruses are not living
b. viruses lack metabolism/lack enzymes «for metabolism»/lack cell walls
c. antibiotics target metabolic «pathways»/cell wall production
[Max 2 Marks]
