Question 17N.2.SL.TZ0.02
| Date | November 2017 | Marks available | [Maximum mark: 4] | Reference code | 17N.2.SL.TZ0.02 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain, State | Question number | 02 | Adapted from | N/A |
The figure shows a transmission electron micrograph of rotavirus particles. Each rotavirus is about 70 nanometres in diameter.
[Source: CDC / Dr. Erskine L. Palmer]
State a reason for using an electron microscope to view this virus rather than a light microscope.
[1]
electron microscope has greater resolution/magnification
OR
70 nm is too small/viruses are too small to be viewed by a light microscope
Rotavirus causes diarrhea and vomiting. Explain why viral diseases cannot be treated using antibiotics.
[2]
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]
State an application of plasmids in biotechnology.
[1]
transfer/vector of genetic material/genes/DNA fragments
OR
to produce insulin/useful protein