State a reason for using an electron microscope to view this virus rather than a light microscope.

Rotavirus causes diarrhea and vomiting. Explain why viral diseases cannot be treated using antibiotics.

State an application of plasmids in biotechnology.

electron microscope has greater resolution/magnification

OR

70 nm is too small/viruses are too small to be viewed by a light microscope

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]

transfer/vector of genetic material/genes/DNA fragments

OR

to produce insulin/useful protein