Multiple choice questions V — task. Science CBSE, Class 9.

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1. Making anti-viral drugs is more difficult than making anti-bacterial
medicines because

viruses have very few biochemical mechanisms of their own
viruses make use of host machinery
viruses are on the border line of living and non-living
viruses have a protein coat

2. Which one of the following causes kala-azar?

Bacteria
Trypanosoma
Ascaris
Leishmania

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