A) Viruses are obligate parasites
B) All fungi are pathogenic
C) All algae are eukaryotes
D) Bacteria are always harmful to mankind
Correct Answer: A
Solution :
All viruses are obligate parasites, as these are active, can multiply and show the living properties only when they have entered their host cell. The term obligate indicates some type of restriction in an organism's way of life from which it cannot depart and survive (eg, a virus and its host).
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