Bacterial Growth Objective Type Questions And Answers

11. Mycotoxins are formed during the end of
a. Lag phase
b. Log phase
c. Death phase
d. Stationary phase
Ans: A

12. Bacteria which need oxygen for growth are called
a. Thermophilic bacteria
b. Microaerophilic bacteria
c. Facultative anaerobic bacteria
d. Mycobacteria
Ans: B

13. pH required for the growth of bacteria is
a. 6.8 – 7.2
b. 5.6 – 8.2
c. 3.0 – 6.0
d. 8.0 – 14.0
Ans: A

14. Drug resistance in bacteria is mainly determined by factor:
a. F
b. R
c. Col
d. Lysogenic factor
Ans: D

15. The ion that is required in trace amounts for the growth of bacteria is
a. Calcium
b. Magnesium
c. Cobalt
d. Sodium
Ans: C

16. The most important vitamin for the growth of bacteria is
a. B-complex
b. Vitamin A
c. Vitamin D
d. Vitamin C
Ans: A

17. The principle in microbiological assays is
a. At certain range the concentration of growth factor will bear a linear relationship to the amount of nutrients added
b. Concentration of growth factor have a linear relationship with the growth of the organism
c. Both a and b
d. None of the above
Ans: B

18. If the source of energy for bacteria is from chemical compounds they are said to be
a. Phototrophs
b. Autotrophs
c. Chemotrophs
d. Chemolithotroph
Ans: C

19. In the synthesis of cell components the major element required is
a. Nitrogen
b. Sulphur
c. Carbon
d. Oxygen
Ans: C

20. For the formation of cell-components the elements required are
a. Nitrogen
b. Oxygen
c. Sulphur
d. All of these
Ans: D

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