Q1. Which of the following statement is incorrect about viruses?
(a) Viruses are obligately parasite
(b) Non-cellular organism replicating inside the living cell
(c) Viruses are saprophytic
(d) Viruses are composed of protein covering surrounding nucleic acid
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All viruses viruses are obligately Parasite, non-cellular organism replicating inside the living cell, viruses are |composed of Protein covering surrounding nucleic acid.
Viruses are obligate filterable parasites capable of independent existence and when they enter inside the body of the host they start utilising the host machinery for its own reproduction.
Viruses are smallest among all microoganisms, viruses can live freely, viruses use the host |cell to reproduce, viruses do not have DNA Or RNA.
Q2. In 1967, Diener and Raymer reported cause of potato spindle tuber, some organisms having nucleic acid, but no protein capsid. They were called
(A) Viroid
(B) Prion
(C) Virion
(D) Virus
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Q3. The genetic material of the retrovirus is?
(A) Single-stranded DNA
(B) Single stranded RNA
(C) Double stranded DNA
(D) Double stranded RNA
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Q4. Prions have ?
(A) Alpha
(B) RNA
(C) DNA
(D) Protein
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Q5. A virus infecting a bacterium is called:
(A) Plasmid
(B) Bacterial RNA
(C) Bacterial DNA
(D) Bacteriophage
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Q6. Which of the following virus genomnes is also called a minichromosome?
(A) TMV
(B) Y-phage
(C) HIV
(D) SV – 40
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Q7. Any temperate bacteriophage existing in latent form inside the bacterial cell is called :
(A) Lysogenic phage
(B) Prophage
(C) Lytic phage
(D) phage
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Q8. On the basis of number and position of flagella Vibrio cholerae is ?
(A) Monotrichous
(B) Atrichous
(C) Amphitrichous
(D) None of them
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Q9. In which of the following plants root nodules are not formed by Rhizobium ?
(A) Casuarina glauca
(B) Glycine max
(C) Cicer arietinum
(D) Cajanus cajan
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