Microbiology in Biotechnology MCQ Questions & Answers

21

Which one of the following is correct about microbial growth medium?

A) Luria-Bertani broth is a synthetic medium B) Nutrient broth is a defined medium C) Sabouraud dextrose agar is a differential medium D) Trypticase soy agar is a complex medium

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Answer & Solution

Answer: Option D

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22

Which of the following statements are correct?
P. Viruses can play a role in causing human cancer.
Q. A tumor suppressor gene can be turned off without any change in its DNA sequence.
R. Alteration in miRNA expression levels contributes to the development of cancer.

A) P and Q only B) Q and R only C) P and R only D) P, Q and R

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Answer & Solution

Answer: Option D

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23

Determine the correctness or otherwise of the following Assertion (A) and Reason (R).
Assertion: Gram negative bacteria show staining with safranin.
Reason: Gram negative bacteria have an outer membrane with lipopolysaccharides.

A) Both (A) and (R) are true and (R) is the correct reason for (A) B) Both (A) and (R) are true but (R) is not the correct reason for (A) C) Both (A) and (R) are false D) (A) is true but (R) is false

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Answer & Solution

Answer: Option A

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24

Match the organisms in Group I with the characteristics in Group II.

Group I	Group II
P. Methanococcus	1. Halophile
Q. Dunaliella	2. Acidophile
R. Sulfolobus	3. Mesophile
S. Escherichia	4. Barophile

A) P-4, Q-3, R-2, S-1 B) P-3, Q-2, R-4, S-1 C) P-2, Q-1, R-4, S-3 D) P-4, Q-1, R-2, S-3

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Answer & Solution

Answer: Option D

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25

Match the microorganisms in Group I with their fermentation products in Group II.

Group I	Group II
P. Leuconostoc mesenteroides	1. Cobalamin
Q. Rhizopus oryzae	2. Sorbose
R. Gluconobacter suboxydans	3. Dextran
S. Streptomyces olivaceus	4. Lactic acid
	5. Butanol

A) P-5, Q-4, R-2, S-1 B) P-5, Q-3, R-2, S-4 C) P-3, Q-4, R-1, S-2 D) P-3, Q-4, R-2, S-1

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Answer & Solution

Answer: Option D

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26

Diphtheria toxin, tetracycline and streptomycin inhibit

A) DNA repair B) DNA replication C) Transcription D) Translation

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Answer & Solution

Answer: Option D

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27

Under stress conditions bacteria accumulate

A) ppGpp (Goanosine tetraphosphate) B) pppGpp (Guanosine pentaphosphate) C) Both ppGpp and pppGpp D) Either ppGpp or pppGpp

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Answer & Solution

Answer: Option B

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28

Match the compounds in Group I with the correct entries in Group II.

Group I	Group II
P. Cyanide	1. K⁺ ionophore
Q. Antimycin A	2. Electron transfer from cytochrome b to cytochrome c₁
R. Valinomycin	3. F₁ subunit of ATP synthase
S. Aurovertin	4. Cytochrome oxidase
	5. Adenine nucleotide translocase

A) P-5, Q-2, R-3, S-1 B) P-5, Q-2, R-1, S-3 C) P-4, Q-2, R-1, S-3 D) P-4, Q-5, R-3, S-1

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Answer & Solution

Answer: Option C

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29

Which combination of the following statements is correct for cyanobacteria?
P. They can perform oxygenic photosynthesis.
Q. Usually filamentous forms are involved in nitrogen fixation.
R. Nitrogen fixation occurs in heterocyst.
S. They cannot grow in a mineral medium exposed to light and air.

A) P, Q and R B) P, S and R C) Q, R and S D) P, Q and S

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Answer & Solution

Answer: Option A

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30

A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is

A) 0.9 B) 0.27 C) 0.009 D) 0.027

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Answer & Solution

Answer: Option D

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Microbiology in Biotechnology MCQ Questions & Answers | Biotechnology