MCQ’s Based on Bacteria and Viruses for ICAR (SRF or JRF) /ASRB /CSIR NET/BET Exams #1

 

1. The functions of plasmid are
   a. DNA replication
   b. Protein synthesis
   c. Cell wall synthesis
   d. None of the above
   Ans: a

2. Mycoplasmas are bacterial cells that
   a. Fail to reproduce on artificial media
   b. Have a rigid cell wall
   c. Are resistant to penicillin
   d. Stain well with Gram’s stain
   Ans: c

3. The bacterial cells are at their metabolic peak during
   a. Lag phase
   b. Log phase
   c. Stationary phase
   d. Decline phase
   Ans: b

4. Protein particles which can infect are called
   a. Virons
   b. Prions
   c. Nucleoida
   d. None of these
   Ans: b

5. The mode of reproduction which occurs in mycoplasma is
   a. Budding
   b. Bursting
   c. Binary fission
   d. Binary fusion
   Ans: a

6. Which one of the following is about Herpes viruses?
   a. Icosahedral, with envelope, ds DNA
   b. Polyhedral with envelope, ds DNA
   c. RNA, helical with envelope
   d. ds DNA, brick shape
   Ans: a

7. The viruses that live as parasites on bacteria are
   a. Fungi
   b. Commensals
   c. Bacteriophages
   d. None of these
   Ans: c

8. The anthrax disease is most frequently infected from
   a. Cattle
   b. Sheeps
   c. Rats
   d. Both a and b
   Ans: d

9. Staining material of gram-positive bacterium is
   a. Fast green
   b. Haematoxylon
   c. Crystal violet
   d. Safranin
   Ans: c

10. The wonder drug of second world war is produced by
    a. Algae
    b. Fungi
    c. Bacteria
    d. Plants
    Ans: b

11. Which one of the following bacteria has found extensive use in genetic engineering work in plants?
    a. Clostridium septicum
    b. Xanthomonas oryza
    c. Bacillus coagulans
    d. Agrobacterium tumefaciens
    Ans: d

12. Diphtheria is caused by
    a. Corynebacterium
    b. Staphylococcus
    c. Streptococcus
    d. None of these
    Ans: a

13. A bacterium containing prophage is called as
    a. Lytic
    b. Lysogen
    c. Lytogen
    d. None of these
    Ans: b

14. An example for common air-borne epidemic disease
    a. Influenza
    b. Typhoid
    c. Encephalitis
    d. Malaria
    Ans: a

15. Viral genome that can become integrated into the bacterial genome is known as
    a. Prophage
    b. Temperate phage
    c. Bacteriophage
    d. Metaphage
    Ans: a

16. Virion means
    a. Infectious virus particles
    b. Non-infectious
    c. Incomplete particles
    d. Defective virus
    Ans: a

17. Bacillus is an example of
    a. Gram +ve bacteria
    b. Gram –ve bacteria
    c. Virus
    d. Viroid
    Ans: a

18. Viral genome that can become integrated into bacterial genome is called
    a. Prophage
    b. Temperate phage
    c. Bacteriophage
    d. Metaphage
    Ans: a

19. The size of virus particle may range
    a. 0.02–0.2 µm
    b. 0.5–10 µm
    c. 0.015–0.2 µm
    d. 0.1–100 µm
    Ans: a

20. Fungus without mycelium is:
    a. Puccinia
    b. Rhizopus
    c. Saccharomyces
    d. Mucor
    Ans: c