1. Which one of the following mineral elements play an important role in biological nitrogen fixation
Correct : D. Molybdenum
2. Rapid bacterial growth phase is known as
Correct : A. Log
3. Clostridium welchii spore formation can be induced only on specified media such as
Correct : C. Ellner medium
4. Mycotoxins are formed during the end of
Correct : A. Lag phase
5. Bacteria which need oxygen for growth
are called
Correct : B. Microaerophilic bacteria
6. pH required for the growth of bacteria is
Correct : A. 6.8 – 7.2
7. Drug resistance in bacteria is mainly
determined by factor:
Correct : D. Lysogenic factor
8. The ion that is required in trace amounts
for the growth of bacteria is
Correct : C. Cobalt
9. The most important vitamin for the
growth of bacteria is
Correct : A. B-complex
10. The principle in microbiological assays is
Correct : B. Concentration of growth factor have a linear relationship with the growth of the organism
11. If the source of energy for bacteria is from
chemical compounds they are said to be
Correct : C. Chemotrophs
12. In the synthesis of cell components the
major element required is
Correct : C. Carbon
13. For the formation of cell-components the
elements required are
Correct : D. All of these
14. For the synthesis of amino acids cysteine, cystine and methionine the element required is
Correct : D. None of these
15. Sulphur can be utilized by bacteria in the
form of
Correct : A. Organic compounds
16. Phosphorous is an essential component
of
Correct : D. All the above
17. Trace elements are
Correct : D. None of these
18. Most bacteria do not require the ion
Correct : C. Na+
19. Vitamin function as
Correct : C. Building blocks of cell
20. The vitamin required for Lactobacillus
species is
Correct : B. Niacin
21. Vitamin K is necessary for the species
Correct : A. Lactobacillus spp.
22. The bacteria which are able to grow at 0°C but which grow at 20°C to 30°C, are known as
Correct : C. Average psychrophiles
23. Radical shifts can be prevented by adding
Correct : C. Buffer
24. The orderly increase in the quantity of all
the cellular components is known as
Correct : B. Growth
25. The most common mode of cell division
in bacteria is
Correct : C. Longitudinal binary fission
26. How much time a bacterium take for the
complete duplication?
Correct : C. 20 min.
27. The generation time is
Correct : C. The total no.of cells formed
28. In bacteria, the increase in population is
in the manner
Correct : A. Geometric progression
29. Physiologically the cells are active and are synthesizing new protoplasm in which stage of the growth in bacteria
Correct : C. Stationary phase
30. The most active stage in the sigmoid curve of bacteria in which maximum growth is attained
Correct : D. Log phase
31. Log-phase is also known as
Correct : C. Lag-phase
32. The no. of generations per hour in a bacteria is
Correct : B. Generation time
33. In the sigmoid curve (or) growth curve of
bacteria how many stages are there
Correct : B. 4
34. The reproduction rate is equal to death
rate in which stage
Correct : D. Log phase
35. Minimum growth temperature is
Correct : B. The lowest temperature at which the microorganisms grow
36. Optimum growth temperature is greater
that 45oC is
Correct : A. Mesophile
37. The organisms which can grow both in
presence and absence of oxygen
Correct : A. Aerobes
38. The organisms which can grow best in the presence of a low concentration of oxygen
Correct : B. Microaerophilic
39. The compound that is added to the medium to absorb oxygen for the creation of anaerobic conditions
Correct : B. Nitrous acid
40. The utilization of light energy to drive the
synthesis of ATP is called as
Correct : C. Photosynthesis
41. During cyclic phosphorylation NADP is
formed or not.
Correct : A. No NADP formation
42. Cyclic phosphorylation is generally
present in
Correct : A. Cyanobacteria
43. Non-cyclic photophosphorylation is also
known as
Correct : B. Photosynthesis
44. The number of ATP molecules formed
during cyclic phosphorylation are
Correct : D. Six
45. Artificial transformation in laboratory is
carried out by treating the cells with
Correct : B. Cacl2
46. The process of formation of mesozygote
is called
Correct : A. Meromixi
47. Wh ich of the fo l low ing organ isms
requires tryptophan for growth?
Correct : D. S.typhi
48. Tubercular bacilli grow best in
Correct : B. Presence of CO2
49. Growth curve does not include following
phases of bacteria –
Correct : D. Synchronous growth
50. Bacteria are more sensitive to antibiotics
at which phase of growth curve?
Correct : D. Log phase
51. The genetic material in HIV is
Correct : A. ds DNA
52. Which one of the following mutagens act
only on replicating DNA?
Correct : C. Acridine orange
53. Poly A tail is frequently found in
Correct : C. eukaryotic RNA
54. Which of the following is an example of
RNA virus?
Correct : C. Tobacco mosaic virus
55. Genomic DNA is extracted, broken into fragments of reasonable size by a restriction endonuclease and then inserted into a cloning vector to generate chimeric vectors. The cloned fragments are called
Correct : B. Genomic library
56. Transgenic animals are produced when
GH gene fused with
Correct : A. MT gene
57. In which medium the hydridoma cells grow selectively?
Correct : B. Hypoxanthine aminopterin thyminine
58. The enzymes which are commonly used
in genetic engineering are
Correct : A. Exonuclease and ligase
59. A successful hybridoma was produced by fusing
Correct : B. Plasma cells and myeloma cells
60. The technique involved in comparing the DNA components of two samples is known as
Correct : B. Genetic finger printing
61. Plasmids are ideal vectors for gene
cloning as
Correct : D. They are self replicating within the bacterial cell
62. Humans normally have 46 chromosomes in skin cells. How many autosomes would be expected in a kidney cell?
Correct : D. 44
63. Pasteur effect is due to
Correct : B. Providing oxygen to anaerobically respiring structures
64. A mechanism that can cause a gene to move from one linkage group to another is
Correct : A. Trans location
65. The smallest unit of genetic material that can undergo mutation is called
Correct : D. Muton
66. The two chromat ids of metaphase chrosome represent
Correct : A. Replicated chromosomes to be separated at anaphase
67. Malate dehydrogenase enzyme is a
Correct : D. Oxido reductase
68. In E.Coli att site is in between
Correct : A. Gal and biogenes
69. The best vector for gene cloning
Correct : A. Relaxed control plasmid
70. A gene that takes part in the synthesis of
polypeptide is
Correct : A. Structural gene
71. DNA replicates during
Correct : B. S – phase
72. A human cell containing 22 autosome
and a ‘Y’ chromosome is probably a
Correct : B. Zygote
73. Crossing-over most commonly occurs
during
Correct : A. Prophase I
74. DNA-replication is by the mechanism of
Correct : B. Semiconservative
75. Production of RNA from DNA is called
Correct : C. Transcription
76. Nucleic acids contain
Correct : B. Adenine
77. What are the structural units of nucleic
acids?
Correct : C. Nucleotides
78. The most important function of a gene is
to synthesize
Correct : A. Enzyme
79. One of the genes present exclusively on the X-chromosome in humans is concerned with
Correct : B. Red-green colour baldness
80. Peptide linkages are formed in between
Correct : B. Amino acids
81. The nucleic acid of polio viruses is
Correct : B. RNA – (+) type
82. Rabies virus is
Correct : C. Enveloped RNA virus
83. Example for DNA virus:
Correct : B. Adeno virus
84. In genetic engineering breaks in DNA are
formed by enzymes known as
Correct : B. Ligases
85. DNA transfer from one bacterium to
another through phages is termed as
Correct : A. Transduction
86. Microorganisms usually make acetyl
CO-A by oxidizing
Correct : A. Acetic acid
87. The method of DNA replication proposed
by Watson and Crick is
Correct : A. Semi conservative
88. The distance between each turn in the
helical strand of DNA is
Correct : B. 34 Ao
89. Self-replicating, small circular DNA molecules present in bacterial cell are known
Correct : A. Plasmid
90. Western blotting is the technique used in
the determination of
Correct : B. DNA
91. m RNA synthesis from DNA is termed
Correct : A. Transcription
92. Western blotting is a technique used in
the determination of
Correct : A. DNA
93. Building blocks of Nucleic acids are
Correct : C. Nucleotides
94. DNA finger printing is based on
Correct : B. Unique sequences
95. The enzyme required for DNA from RNA
template:
Correct : B. Reverse transcriptase
96. Double standard RNA is seen in
Correct : A. Reo viru
97. The two strands of DNA are joined noncovalently by
Correct : C. Hydrogen bonds between bases
98. The bases Adenine and Thymine are
paired with
Correct : A. Double hydrogen bonds
99. The no. of hydrogen bonds existing
between Guanine and Cytosine are