Common Bacterial Growth Objective Type Questions And Answers

51. The number of ATP molecules formed during cyclic phosphorylation are
a. One
b. Two
c. Four
d. Six
Ans: D

52. Artificial transformation in laboratory is carried out by treating the cells with
a. MgCl2
b. Cacl2
c. NaCl
d. HCl
Ans: B

53. The process of formation of mesozygote is called
a. Meromixis
b. Exozygote
c. Mitosis
d. Meiosis
Ans: A

54. Which of the following organisms requires tryptophan for growth?
a. H.influenza
b. Vibrio
c. Gonococci
d. S.typhi
Ans: D

55. Tubercular bacilli grow best in
a. Absence of O2
b. Presence of CO2
c. Presence of O2
d. None of these
Ans: B

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

60. The suitable temperature to transport viral culture is –
a. 30oC
b. 5oC
c. 25oC
d. 45oC
e. None of these
Ans: B

61. Growth curve does not include following phases of bacteria –
a. Decline phase
b. Stationary phase
c. Lag phase
d. Synchronous growth
Ans: D

62. Bacteria are more sensitive to antibiotics at which phase of growth curve?
a. Decline phase
b. Stationary phase
c. Lag phase
d. Log phase
Ans: D

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Basic Bacterial Growth Objective Type Questions And Answers

41. The reproduction rate is equal to death rate in which stage
a. Decline phase
b. Stationary phase
c. Lag phase
d. Log phase
Ans: D

42. Minimum growth temperature is
a. The growth of organisms at lowest temperature
b. The lowest temperature at which the microorganisms grow
c. The maximum temperature at which the growth is stable
d. None of these
Ans: B

43. Optimum growth temperature is greater that 45oC is
a. Mesophiles
b. Thermophiles
c. Psychrophiles
d. None of these
Ans: A

44. The organisms which can grow both in presence and absence of oxygen
a. Aerobes
b. Anaerobes
c. Faculative anaerobes
d. Strict aerobes
Ans: A

45. The organisms which can grow best in the presence of a low concentration of oxygen
a. Aerophilic
b. Microaerophilic
c. Aerobic
d. Anaerobic
Ans: B

46. The compound that is added to the medium to absorb oxygen for the creation of anaerobic conditions
a. Sodium Thioglycollate
b. Nitrous acid
c. Citrate
d. None of these
Ans: B

47. The utilization of light energy to drive the synthesis of ATP is called as
a. Photolysis
b. Photophosphorylation
c. Photosynthesis
d. Respiration
Ans: C

48. During cyclic phosphorylation NADP is formed or not.
a. No NADP formation
b. No NADP utilization
c. NADP is converted into NADPH
d. All are correct
Ans: A

49. Cyclic phosphorylation is generally present in
a. Cyanobacteria
b. Algae
c. Bacteria
d. Plants
Ans: A

50. Non-cyclic photophosphorylation is also known as
a. Oxygenic photosynthesis
b. Photosynthesis
c. Anoxygenic photosynthesis
d. Photophosphorylation
Ans: B

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Bacterial Growth Online Quiz Questions And Answers

31. The orderly increase in the quantity of all the cellular components is known as
a. Reproduction
b. Growth
c. Binary fission
d. None of these
Ans: B

32. The most common mode of cell division in bacteria is
a. Binary fission
b. Transverse binary fission
c. Longitudinal binary fission
d. None of these
Ans: C

33. How much time a bacterium take for the complete duplication?
a. 30 min.
b. 10 min.
c. 20 min.
d. 25 min.
Ans: C

34. The generation time is
a. The time required for the cell to divide
b. The total division of the cell during its life time
c. The total no.of cells formed
d. None of these
Ans: C

35. In bacteria, the increase in population is in the manner
a. Geometric progression
b. Multiplication
c. Doubling
d. None of these
Ans: A

36. Physiologically the cells are active and are synthesizing new protoplasm in which stage of the growth in bacteria
a. Log phase
b. Lag phase
c. Stationary phase
d. None of these
Ans: C

37. The most active stage in the sigmoid curve of bacteria in which maximum growth is attained
a. Lag phase
b. Stationary phase
c. Decline phase
d. Log phase
Ans: D

38. Log-phase is also known as
a. Death phase
b. Exponential phase
c. Lag-phase
d. None
Ans: C

39. The no. of generations per hour in a bacteria is
a. Growth rate
b. Generation time
c. Sigmoid curve
d. None of these
Ans: B

40. In the sigmoid curve (or) growth curve of bacteria how many stages are there
a. 3
b. 4
c. 2
d. 5
Ans: B

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Bacterial Growth Multiple Choice Questions And Answers

21. For the synthesis of amino acids cysteine, cystine and methionine the element required is
a. Sulphur
b. Oxygen
c. Nitrogen
d. None of these
Ans: D

22. Sulphur can be utilized by bacteria in the form of
a. Organic compounds
b. Inorganic compounds
c. Elemental compounds
d. All of the above
Ans: A

23. Phosphorous is an essential component of
a. Nucleotides
b. Nucleic acids
c. Phospholipids and Heichoic acids
d. All the above
Ans: D

24. Trace elements are
a. Zn+2, Cu+2, Mn+2
b. MO6+, Ni2+, B3+ and CO2+
c. Both a and b
d. None of these
Ans: D

25. Most bacteria do not require the ion
a. Mg2+
b. Ca2+
c. Na+
d. Fe+2
Ans: C

26. Vitamin function as
a. Co-enzymes
b. Co-melecules
c. Building blocks of cell
d. None of these
Ans: C

27. The vitamin required for Lactobacillus species is
a. Riboflavin
b. Niacin
c. Pyridoxine
d. Folic acid
Ans: B

28. Vitamin K is necessary for the species
a. Lactobacillus spp.
b. Bacillus anthracis
c. Bacteroides melaninogenicus
d. All of these
Ans: A

29. The bacteria which are able to grow at 0°C but which grow at 20°C to 30°C, are known as
a. Psychrophiles
b. Facultative psychrophiles
c. Average psychrophiles
d. Mesophiles
Ans: C

30. Radical shifts can be prevented by adding
a. Acids
b. Alkali
c. Buffer
d. None of these
Ans: C

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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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62 Top Bacterial Growth Objective Type Questions And Answers

1. Multiple antibiotic resistance is mediated by
a. Episome
b. Plasmid
c. Colplasmid
d. Both b and c
Ans: B

2. “Antagonism “ is seen in
a. Lag phase
b. Plasmids
c. Log phase
d. None of these
Ans: D

3. the first phase of a growth curve is
a. Log phase
b. Lag phase
c. ? phase
d. Both a and b
Ans: B

4. In gram positive and gram negative bacteria the electron transport contains
a. Naphthquinone
b. Plastoquinone
c. Ubiquinone
d. Both a and b
Ans: A

5. Growth in a closed system, affected by nutrient limitation and waste product accumulation is called
a. Batch culturing
b. Ascus
c. Fruiting body
d. Sporangiosphore
Ans: A

6. Cells are active and synthesizing new protoplasm. This stage of growth is called 
a. Lag phase
b. Stationary phase
c. Log phase
d. All of these
Ans: A

7. Which one of the following tissues can metabolize glucose, fatty acids and ketone bodies for ATP production?
a. Liver
b. Muscle
c. Brain
d. R.B.C
Ans: B

8. Which one of the following mineral elements play an important role in biological nitrogen fixation
a. Copper
b. Magnesium
c. Zinc
d. Molybdenum
Ans: D

9. Rapid bacterial growth phase is known as
a. Log
b. Lag
c. Lack
d. None of these
Ans: A

10. Clostridium welchii spore formation can be induced only on specified media such as
a. Wilson-Blair medium
b. Macconkey medium
c. Ellner medium
d. Thayee-Martion medium
Ans: C

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