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Systematics Viruses Viroids Prions - Questions and Answers

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231. What is true about viruses?
A. They can be crystallized and stored for several years
B. Viruses do not occur as parasites in living cells
C. They can be cultured on artificial media
D. They are devoid of genetic material of their own
Explanation:
232. Viroids have
A. Single stranded RNA not enclosed by protein coat
B. Single stranded DNA not enclosed by protein coat
C. Double stranded DNA enclosed by protein coat
D. Double stranded RNA enclosed by protein coat
Explanation:
233. Which viral disease is spread by mosquito
A. Plague
B. Typhus
C. Yellow fever
D. Elephantiasis
Explanation:
234. Viruses are no more “alive” than isolated chromosomes because
A. They require both RNA and DNA
B. They both need food molecules
C. They both require oxygen for respiration
D. Both require the environment of a cell to replicate
Explanation:
235. Classification reflecting the evolutionary inter-relationships of organisms is called
A. Phylogenetic classification
B. Artificial classification
C. Natural classification
D. Numerical classification
Explanation:
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