MCQs On Virus and Bacteria

Biology Virus and Bacteria

Virus and Bacteria

1. Viral genes are made of
a. RNA only
b. DNA only
c. Either DNA or RNA
d. Either protein or nucleic acid

2. A virion is a
a. Virus
b. Viral ribosome

c. Viral lysosomes
d. Viral gene

3. An isolated virus is not considered living since it
a. Separates into tw inerts part
b. Cannot metabolize
c.  Rapidly loses its genome
d. Is coated with air-tight , chemically inert sheild

4. Most RNA viruses carry a gene for an enzyme that uses viral RNA as template in the synthesis of more viral RNA this enzyme is
a. Reverse transcriptase
b. RNA polymerase

c. Viral nuclease
d. RNA replicase

5. The enzymes involved in viral replication are synthesized
a. On the viral ribosome
b. By the host cell
c. On the interior surface of the viral membrane
d. On the interior surface of the viral coat

6. Much of the research on gene expression has been done with E.coli, which inhibits the human intestine.This organism is a
a. Plasmid
b. Virus
c. Bacterium
d. Protozoan

7. In general bacterial genes are regulated at the time of
a. Transcription
b. Post-transcription
c. Translation
d. Cojugation

8. When DNA is exchanged via eytoplasmic bridges between two bacteria the process is called
a. Transduction
b. Conjugation
c. Transformation
d. Recombination

9. When a bacteriophage in its lytic phase  carries some of the bacterium's partially digested chromosome with it to another host cell the process is called
a. Conjugation
b. Transformation
c. Transduction
d. Restricted transduction

10. A bacteriophage with a lysogenic cycle must have genes that are
a. Made of RNA
b. Made of double-stranded DNA
c. Made of single-stranded RNA or DNA
d. With in a circular nucleic acid molecule

11. which of the following fungus is used to give the flavour , aroma and Characteristics colour to some cheese?
a. Yeast
b. Ergot fungi
c. Aspergillus
d. Penicillium

12. According to mode respiration  which one of the following group of bacteria can grow either in the presence or absence of oxygen?
a. Facultativebacteria ( E.coli )
b. Microaeerophilic ( campylobacter )
c. Pseudomonas
d.Spirochete

13. which one is true for Pox-viruses?
a. RNA-enveloped
b. DNA-non enveloped
c. DNA-enveloped
d. DNA-naked virion

14. A disease virus in which nerves are damaged is the
a. Yellow fever
b. Polio
c. Measles
d. Xerophthalmia

15. In some bacteria when division ocurrs in random plane it will produce an Arrangement called
a. Streptococcus
b. sarcina
c. Diplococcus
d. Staphylococuus

16. Gram positive bacteria are usually
a. Cocci
b. Bacilli
c. Stained pink
d. Spirochete

17. A viral disease in which brain of the host is affected is the
a. Sleeping sickness
b. Rabies
c. Pellagra
d. Typhoid

18. Mumps and measles viruses belong to group paramyxo-viruses which are the
a. RNA enveloped viruses
b. DNA naked viruses
c. RNA non-enveloped
d. DNA enveloped viruses

19. There are about known species of bacteria that causes the diseases in man
a. 250
b. 150
c. 200
d. 300

20. Morphologically the tobacco mosaic virus is the
a. Round shape
b. Tadpole like
c. Cubical shape
d. Rod shape

21. The flavour,all of the following is due to bacterial activity, except that of
a. Butter milk
b. Yogurt
c.Ice crem
d. Cheese

22. A scientist who established principles of immunity in "Anthrax &Rbies" was the
a. Leeuwenhoek
b.Pasteur
c.Koch
d.Jenner

23. The poison, produced by bacteria during infection in host is called
a. Toxins
b.Antitoxins
c. Toxoids
d.Afflotoxins

24. All of the following are antibiotics, except that of
a. Penicillin
b. Streptomycin
c. Riboflavin
d. Terramycin

25. Bacteria ranges in size, whereas, the staphylococcus&streptococcus are in diameter
a. 0.75 to 1.25  m
b. 1.1 to 1.50 m
c. 2.0 to 6.0 m
d. 0.75 to 1.75 m

26. Which one is true for periplasmic space ,in different groups of bacteria
a. Present in all gram -negative bacteria
b. Present in all gram positive bacteraia
c. Present in few gram negative bacteria
d. Present in all gram positive&few gram negative bacteria

27. The amount of lipid in outer noundry of gtam positive bacteria is about
a. 1-4 %
b. 11-12%
c.8-11%
d. 20-60%

28, Which one of the following antibiotics &related compounds cause permanent discoloration of teeth in young children
a. Tetracyclin
b. Terramycin
c. Streptomycin
d. Penicillin

29, Antibiotics are synthesized by certain organisms such as
a. Penicillium
b. Actinomycetes
c. Both a%b
d. Oscilletoria

30. Ecological role of fungi as decomposers is parallled only by
a. Virus
b. Bacteria
c. Detrius
d.Nematodes

31. Are very good bio-indicator of air quality as they are very sensitive to pollution
a. Bacteria
b. Mycorrhizae
c. Lichens
d. Water blooms

32. Induction is a process in which a viral DNA
a. Enters into bacterial cell and attached with bacterial DNA
b.Detached from bacterial DNA
c. Destroy the bacterial DNA
d. Multiply with bacterial DNA