Explore topic-wise MCQs in Microbiology.

This section includes 29 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.

1.

Match the products in group 1 with their producer organisms given in group 2
Group 1
P. Ethanol
Q. L-Lysine
R. Biopesticide
S. Vancomycin
Group 2
1. Streptomyces orientalis
2. Saccharomyces cerevisiae
3. Corynebacterium glutamicum
4. Bacillus thuringiensis

A. P-2, Q-3, R-4, S-1
B. P-3, Q-4, R-1, S-2
C. P-4, Q-1, R-2, S-3
D. P-2, Q-1, R-4, S-3
Answer» B. P-3, Q-4, R-1, S-2
Discussion
2.

Match the commercial microbial sources in Group I with the products in Group II.
Group I
P. Corynebacteriumlilium
Q. Klebsiellaoxytoca
R. Aspergillusniger
S. Alcaligeneseutrophus
Group II
1. 2,3-Butane di-ol
2. Poly- -hydroxybutyric acid
3. Glutamic acid
4. Citric acid

A. P-3,Q-1,R-2,S-4
B. P-3,Q-1,R-4,S-2
C. P-1,Q-3,R-2,S-4
D. P-1,Q-3,R-4,S-2
Answer» C. P-1,Q-3,R-2,S-4
Discussion
3.

Match the cell structures in Group I with the organismsin Group II.
Group I
P. Endospores
Q. Bipolar flagella
R. Pseudomurine in cell wall
S. Periplasmic flagella
Group II
1. Methanobacterium
2. Treponema
3. Spirillum
4. Clostridium

A. P-4, Q-3, R-1, S-2
B. P-4, Q-3, R-2, S-1
C. P-3, Q-4, R-1, S-2
D. P-4, Q-1, R-3, S-2
Answer» B. P-4, Q-3, R-2, S-1
Discussion
4.

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
Answer» C. P, R and S only
Discussion
5.

Match the products in Group I with the microbial cultures in Group II used for their industrial production
Group I Group II
P. Gluconic acid 1. Leuconostoc mesenteroids
Q. L Lysine 2. Aspergillus niger
R. Dextran 3. Brevibacterium flavum
S. Cellulase 4. Trichoderma reesei

A. P-2, Q-1, R-3, S-4
B. P-1, Q-3, R-4, S-2
C. P-2, Q-3, R-1, S-4
D. P-3, Q-2, R-4, S-1
Answer» D. P-3, Q-2, R-4, S-1
Discussion
6.

A bacterium belonging to cocci group has a diameter of 2 m. The numerical value of the ratio of its surface area to volume (in m 1) is ______

A. 0
B. 1
C. 2
D. 3
Answer» E.
Discussion
7.

Match the microorganisms in Group I with their fermentation products in Group II.
Group I Group II
P. Leuconostoc mesenteroids 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
Answer» E.
Discussion
8.

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 heterocysts
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
Answer» B. P, S and R
Discussion
9.

Match Group I with Group II
Group I Group II
P. Staphylococcus aureus 1. Biofilms
Q. Candida albicans 2. Bacteriocins
R. Mycobacterium 3. Methicillin tuberculosis resistance
S. Lactobacillus lactis 4. Isoniazid

A. P-1, Q-4, R-2, S-3
B. P-2, Q-3, R-1, S-4
C. P-3, Q-1, R-4, S-2
D. P-1, Q-2, R-4, S-3
Answer» D. P-1, Q-2, R-4, S-3
Discussion
10.

Match the products in Group 1 with their producer organisms in Group 2 :
Group 1 Group 2
P. Ethanol from glucose 1. Aspergillus niger
Q. Probiotics 2. Leuconostoc mesenteroides
R. Citric acid 3. Saccharomyces cerevisiae
S. Sauerkraut 4. Bifidobacterium

A. P-1, Q-3, R-2, S-4
B. P-3, Q-4, R-1, S-2
C. P-3, Q-4, R-2, S-1
D. P-1, Q-4, R-3, S-2
Answer» C. P-3, Q-4, R-2, S-1
Discussion
11.

A bacterium belonging to cocci group has a diameter of 2 m. The numerical value of the ratio of its surface area to volume (in m

A. 0
B. 1
C. 2
D. 3
Answer» E.
Discussion
12.

Gram-positive bacteria are generally resistant to complement-mediated lysis because

A. thick peptidoglycan layer prevents insertion of membrane attack complex into the inner membrane
B. Gram-positive bacteria import the membrane attack complex and inactivate it
C. membrane attack complex is degraded by the proteases produced by the Gram-positive bacteria
D. Gram-positive bacteria cannot activate the complement pathway
Answer» B. Gram-positive bacteria import the membrane attack complex and inactivate it
Discussion
13.

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

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
Answer» E.
Discussion
14.

Which one of the following organisms is used for the determination of phenol coefficient of a disinfectant ?

A. Salmonella typhi
B. Escherichia coli
C. Candida albicans
D. Bacillus psychrophilus
Answer» B. Escherichia coli
Discussion
15.

The lipopolysaccharides present in bacterial cell wall has lipid A which is connected to

A. O-polysaccharide
B. core polysaccharide
C. both with O-polysaccharide and core polysaccharide
D. rhamnose-mannose disaccharide
Answer» C. both with O-polysaccharide and core polysaccharide
Discussion
16.

Which combination of the following statements is CORRECT for cyanobacteria ?

A. P, Q and R
B. P, S and R
C. Q, R and S
D. P, Q and S
Answer» B. P, S and R
Discussion
17.

Which one of the following DOES NOT belong to the domain of Bacteria?

A. Cyanobacteria
B. Proteobacteria
C. Bacteroids
D. Methanobacterium
Answer» B. Proteobacteria
Discussion
18.

Under stress conditions bacteria accumulate

A. ppGpp (Guanosine tetraphosphate)
B. pppGpp (Guanosine pentaphosphate)
C. both ppGpp pppGpp
D. either ppGpp or pppGpp
Answer» D. either ppGpp or pppGpp
Discussion
19.

Gas vacuoles are present in

A. Anabaena flos-aquae
B. Bacillus subtilis
C. Acanthurus nigrofuscus
D. Mycobacterium tuberculosis
Answer» B. Bacillus subtilis
Discussion
20.

Match the products in Group I with the microbial cultures in Group II used for their industrial production

A. P-2, Q-1, R-3, S-4
B. P-1, Q-3, R-4, S-2
C. P-2, Q-3, R-1, S-4
D. P-3, Q-2, R-4, S-1
Answer» D. P-3, Q-2, R-4, S-1
Discussion
21.

Match the cell structures in Group I with the organismsin Group II.

A. P-4, Q-3, R-1, S-2
B. P-4, Q-3, R-2, S-1
C. P-3, Q-4, R-1, S-2
D. P-4, Q-1, R-3, S-2
Answer» B. P-4, Q-3, R-2, S-1
Discussion
22.

Match the commercial microbial sources in Group I with the products in Group II.

A. P-3,Q-1,R-2,S-4
B. P-3,Q-1,R-4,S-2
C. P-1,Q-3,R-2,S-4
D. P-1,Q-3,R-4,S-2
Answer» C. P-1,Q-3,R-2,S-4
Discussion
23.

Phylum proteobacteria is subdivided into -, -, -and -proteobacteria based on

A. G + C content
B. 23S rRNA sequences
C. tRNA sequences
D. 16S rRNA sequences
Answer» E.
Discussion
24.

Which of the following essential element(s) is/are required as major supplement to enhance the bioremediation of oil spills by the resident bacteria?

A. Sulfur
B. Nitrogen and phosphorus
C. Iron
D. Carbon
Answer» C. Iron
Discussion
25.

Which of the following are TRUE for Treponema pallidum?

A. P, Q and R only
B. P, Q and S only
C. P, R and S only
D. Q, R and S only
Answer» C. P, R and S only
Discussion
26.

Which of the following eukaryotic organisms has been proven to be of great industrial importance ?

A. Penicillium chrysogenum
B. Saccharomyces cerevisiae
C. Bacillus subtilis
D. Streptomyces griseus
Answer» C. Bacillus subtilis
Discussion
27.

Microbes bring about biological transformation of xenobiotic compounds by

A. degradation
B. conjugation
C. detoxification
D. all of these
Answer» E.
Discussion
28.

Match the products in group 1 with their producer organisms given in group 2

A. P-2, Q-3, R-4, S-1
B. P-3, Q-4, R-1, S-2
C. P-4, Q-1, R-2, S-3
D. P-2, Q-1, R-4, S-3
Answer» B. P-3, Q-4, R-1, S-2
Discussion
29.

Match the products in Group 1 with their producer organisms in Group 2 :

A. P-1, Q-3, R-2, S-4
B. P-3, Q-4, R-1, S-2
C. P-3, Q-4, R-2, S-1
D. P-1, Q-4, R-3, S-2
Answer» C. P-3, Q-4, R-2, S-1
Discussion