Microbiology in Biotechnology MCQ Questions & Answers

31

The most plausible explanation for a sudden increase of the respiratory quotient (RQ) of a microbial culture is that

A) Cells are dying B) Yield of biomass is increasing C) The fermentation rate is increasing relative to respiration rate D) The maintenance rate is decreasing

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Answer & Solution

Answer: Option C

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32

Match the following antibiotics in Group I with their mode of action in Group II.

Group I	Group II
P. Chloramphenicol	1. Binds to DNA gyrase
Q. Norfloxacin	2. Binds to RNA Polymerase
R. Puromycin	3. Inhibits peptidyl transferase
S. Rifampicin	4. Mimics aminoacyl-tRNA

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

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Answer & Solution

Answer: Option C

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33

The typical coenzyme present in the methanogens is

A) Coenzyme A B) Coenzyme Q C) Coenzyme M D) None of the above

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Answer & Solution

Answer: Option C

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34

Match the antibiotics in Group I with the targets in Group II.

Group I	Group II
P. Sulfonamide	1. Peptidoglycan synthesis
Q. Quinolones	2. Peptide chain elongation
R. Erythromycin	3. Folic acid biosynthesis
S. Cephalosporin	4. Topoisomerase

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

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Answer & Solution

Answer: Option D

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35

A microorganism isolated from a salt-rich (salt concentration ∼2 M) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as the major lipid component of its cell membrane. The isolated organism is

A) A planctomycete B) A cyanobacteria C) A unicellular amoeba D) An archaea

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Answer & Solution

Answer: Option D

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36

Bacteria with two or more flagella at one or both ends are called

A) Amphitrichous B) Peritrichous C) Lophotrichous D) Atrichous

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Answer & Solution

Answer: Option C

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37

Which one of the following is not a product of denitrification in Pseudomonas?

A) N₂ B) N₂O C) NO₂ D) NH₄⁺

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Answer & Solution

Answer: Option D

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38

Which of the following are true for Treponema pallidum?
P. It is the causative agent of syphilis
Q. It is a spirochete
R. It is a non-motile bacterium
S. It is generally susceptible to penicillin
Choose the correct combination.

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

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Answer & Solution

Answer: Option B

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39

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

Group I	Group II
P. Clostridium	1. Rods with teichoic acid in the cell wall
Q. Escherichia	2. Rods with endospores
R. Vibrio	3. Helical rods with flagella
S. Bacillus	4. Rods with LPS in the outer membrane
	5. Curved rods with polar flagella

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

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Answer & Solution

Answer: Option A

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40

Which family of viruses has single stranded DNA?

A) Herpesviridae B) Poxviridae C) Retroviridae D) Parvoviridae

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Answer & Solution

Answer: Option D

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Microbiology in Biotechnology MCQ Questions & Answers | Biotechnology