Explore topic-wise MCQs in Microbiology.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.

1.

Bayer’s junctions are sites which help in joining which of the following?

A. cytoplasmic membrane and outer membrane
B. outer membrane and capsule
C. cytoplasmic membrane and periplasmic space
D. peptidoglycan layer and cytoplasmic membrane
Answer» B. outer membrane and capsule
Discussion
2.

Which of the following are present in teichoic acids?

A. ribitol residues
B. glycerol residues
C. glucose residues
D. ribitol or glycerol residues
Answer» E.
Discussion
3.

Gram-negative bacteria are more resistant to antibiotics due to the presence of?

A. Thin peptidoglycan wall
B. Outer lipopolysaccharide layer
C. Porin proteins
D. Teichoic acid
Answer» C. Porin proteins
Discussion
4.

NAG and NAM of peptidoglycan layer is linked by _________

A. beta-(1,4) glycosidic linkage
B. alpha-(1,4) glycosidic linkage
C. alpha-(1,6) glycosidic linkage
D. beta-(1,6) glycosidic linkage
Answer» B. alpha-(1,4) glycosidic linkage
Discussion
5.

Porins are special proteins act as channels in the outer membrane of Gram-negative bacteria.

A. True
B. False
Answer» B. False
Discussion
6.

The outer membrane of the Gram-negative cell wall is anchored to the underlying peptidoglycan by means of which of the following?

A. Braun’s Lipoprotein
B. Phospholipids
C. Proteins
D. Lipopolysaccharide
Answer» B. Phospholipids
Discussion
7.

Peptidoglycan layer is present in large quantity in?

A. Gram-positive bacteria
B. Gram-negative bacteria
C. Fungi
D. Algae
Answer» B. Gram-negative bacteria
Discussion
8.

GRAM-NEGATIVE_BACTERIA_ARE_MORE_RESISTANT_TO_ANTIBIOTICS_DUE_TO_THE_PRESENCE_OF??$

A. Thin peptidoglycan wall
B. Outer lipopolysaccharide layer
C. Porin proteins
D. Teichoic acid
Answer» C. Porin proteins
Discussion
9.

Bayer’s junctions are sites which help in joining which of the following?$#

A. cytoplasmic membrane and outer membrane
B. outer membrane and capsule
C. cytoplasmic membrane and periplasmic space
D. peptidoglycan layer and cytoplasmic membrane
Answer» B. outer membrane and capsule
Discussion
10.

Which_of_the_following_are_present_in_teichoic_acids?$

A. ribitol residues
B. glycerol residues
C. glucose residues
D. ribitol or glycerol residues
Answer» E.
Discussion
11.

NAG and NAM of peptidoglycan layer is linked by ________?

A. beta-(1,4) glycosidic linkage
B. alpha-(1,4) glycosidic linkage
C. alpha-(1,6) glycosidic linkage
D. beta-(1,6) glycosidic linkage
Answer» B. alpha-(1,4) glycosidic linkage
Discussion
12.

Porins are special proteins act as channels in outer membrane of Gram-negative bacteria.

A. True
B. False
Answer» B. False
Discussion
13.

Which among the following acts as receptors for bacteriophage attachment in Gram-negative bacteria?

A. Cilia
B. O antigens
C. Lipid A
D. Teichoic acid
Answer» C. Lipid A
Discussion
14.

The outer membarane of the Gram-negative cell wall is anchored to the underlying peptidoglycan by means of which of the following?

A. Braun’s Lipoprotein
B. Phospholipids
C. Proteins
D. Lipopolysaccharide
Answer» B. Phospholipids
Discussion
15.

Cord factor is a ___________

A. protein
B. teichoic acid derivative
C. mycolic acid derivative
D. carbohydrate
Answer» D. carbohydrate
Discussion
16.

Teichoic acid present in Gram-positive bacteria can bind to which ion?

A. Fe ions
B. Phosphorus ions
C. Mg ions
D. Sulphur ions
Answer» D. Sulphur ions
Discussion
17.

Peptidoglycan is made up of __________

A. N-acetylglucosamine
B. N-acetylmuramic acid
C. N-acetylglucosamine, N-acetylmuramic acid
D. N-acetylglucosamine,N-acetylmuramic acid,amino acids
Answer» E.
Discussion
18.

Peptidoglycan layer is present in large quantity in?

A. Gram-positive bacteria
B. Gram-negative bacteria
C. Fungi
D. Algae
Answer» B. Gram-negative bacteria
Discussion