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Bacteria Morphology MCQ Questions & Answers

Bacteria Morphology MCQs : This section focuses on the "Bacteria Morphology". These Multiple Choice Questions (MCQs) should be practiced to improve the Bacteria Morphology skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

The last step in synthesis of peptidoglycan is

A. attachment of a peptide to muramic acid
B. attaching two amino acids to form a cross-link
C. attachment of a portion of peptidoglycan to a membrane lipid
D. binding of penicillin to a membrane protein

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Question 2

Which of the following has peptidoglycan as a major constituent of cell wall?

A. Gram-negative bacteria
B. Gram-positive bacteria
C. Fungi
D. None of these

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Question 3

The cell walls of Gram positive bacteria contain two modified sugar, viz. N- acetylgucosamine (NAG) and N- acetylmuramic acid (NAM). They are covalently linked by

A. α- 1,4-glycosidic bond
B. β-1,6-glycosidic bond
C. α- 1,6-glycosidic bond
D. β- 1,4-glycosidic bond

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Question 4

Gram positive cells have a

A. second outer membrane that helps to retain the crystal violet stain
B. multiple layer of peptidoglycan that helps to retain the crystal violet stain
C. thick capsule that traps the crystal violet stain
D. periplasmic space that traps the crystal violet

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Question 5

The cell wall of

A. gram-positive bacteria are thicker than gram-negative bacteria
B. gram-negative bacteria are thicker than gram-positive bacteria
C. both have same thickness but composition is different
D. None of the above

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Question 6

Which of the following is true about cell wall of gram-positive bacteria?

A. It consists of multiple layers
B. It is thicker than that associated with gram-negative bacteria
C. It contains teichoic acids
D. All of the above

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Question 7

Single or clusters of flagella at both poles is known as

A. monotrichous
B. petritrichous
C. amphitrichous
D. none of these

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Question 8

Peptidoglycan is found only in the bacterial

A. cell membrane
B. glycocalyx
C. cell wall
D. spore

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Question 9

A cluster of polar flagella is called

A. lophotrichous
B. amphitrichous
C. monotrichous
D. petritrichous

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Question 10

Which of the following may be most likely to be missing from a gram-positive bacterium?

A. Penicillin binding protein
B. Peptidoglycan
C. Lipopolysaccharide
D. Phospholipid bilayer membrane

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Question 11

Which is most likely to be exposed on the surface of a gram-negative bacterium?

A. Pore protein (porin)
B. Protein involved in energy generation
C. Lipoteichoic acid
D. Phospholipids

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Question 12

In eukaryotic cells, ribosomes are

A. 70S
B. 60S
C. 80S
D. Not specific

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Question 13

Name the component of flagellum.

A. Filament
B. Hook
C. Basal body
D. All of these

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Question 14

The common word for bacteria which are straight rod in shape is

A. cooci
B. bacilli
C. spirilla
D. pleomorphic

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Question 15

Genetic system is located in the prokaryotes in

A. nucleoid
B. chromatin
C. nuclear material
D. all of these

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Question 16

The bacteria deficient in cell wall is

A. Treponema
B. Mycoplasma
C. Staphylococcus
D. Klebsiella

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Question 17

The cooci which mostly occur in single or pairs are

A. Streptococci
B. Diplococci
C. Tetracocci
D. None of the above

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Question 18

The location where the bacterial chromosome concentrates is called

A. nucleus
B. nuclein
C. nucleoid
D. nucleose

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Question 19

Which of the following is not true about peptidoglycan?

A. It is a polymer consisting of N-acetyl glucosamine, N-acetyl muramic acid and amino acids (alanine, lysine, etc.)
B. It is present in prokaryotic cell wall
C. It occurs in the form of a bag shaped macro molecule surrounding the cytoplasm membrane
D. None of the above

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Question 20

Which of the following has Chinese letter arrangement?

A. Bacillus anthracis
B. Mycobacterium tuberculosis
C. Clostridium tetani
D. Corynebacterium diphtheriae

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Question 21

A single polar flagella is known as

A. monotrichous
B. lophotrichous
C. amphitrichous
D. none of these

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Question 22

The cooci which mostly occur in single or pairs are

A. Streptococci
B. Diplococci
C. Tetracocci
D. None of these

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Question 23

The common word for bacteria which are helically curved rods is

A. cooci
B. pleomorphic
C. bacillus
D. spirilla

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Question 24

Which of the following organism has sterols in their cytoplasmic membrane?

A. Clostridum
B. Proteus
C. Mycoplasma
D. Bacillius

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Question 25

Periplasm is

A. the area between the inner and outer membranes of gram-negative bacteria
B. the area between the inner and outer membranes of Gram-positive bacteria
C. the interior portion of mitochondria
D. the area outside the cell membrane that is influenced by the polymers

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Question 26

Cytoplasmic inclusions include

A. ribosomes
B. mesosomes
C. fat globules
D. All of these

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Question 27

Cyanobacteria have

A. a gram-positive cell wall
B. a gram-negative cell wall
C. Neither (a) nor (b)
D. No cell wall

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Question 28

Chemotaxis is a phenomenon of

A. swimming away of bacteria
B. swimming towards a bacteria
C. swimming away or towards of bacteria in presence of chemical compound
D. none of the above

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Question 29

Which of the following may contain fimbriae?

A. Gram-positive bacteria
B. Gram-negative bacteria
C. Both A and B
D. None of the above

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Question 30

The cocci which forms a bunch and irregular pattern are

A. Staphylococci
B. diplococci
C. Tetracocci
D. Streptococci

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Question 31

Which of the following structure(s) is /are external to cell wall?

A. Flagella
B. Stalks
C. Sheath
D. All of these

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Question 32

Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?

A. Cyanobacteria
B. Mycoplasmas
C. Bdellovibrios
D. Spirochetes

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Question 33

Flagella move the cell by

A. many flagella beating in a synchronous, whip-like motion
B. an individual flagellum beating in a whip-like motion
C. spinning like a propeller
D. attaching to nearby particles and contracting

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Question 34

The common word for bacteria which are spherical in shape is

A. cocci
B. bacilli
C. spirilla
D. pleomorphic

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Question 35

Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria

A. 50% or more
B. About 10%
C. 11%+ 0.22%
D. About 20%

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Question 36

Chemically the capsule may be

A. polypeptide
B. polysaccharide
C. either (a) or (b)
D. none of these

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Question 37

Which of the following is exposed on the outer surface of a gram-negative bacterium?

A. O-antigen of lipopolysaccharide (LPS)
B. Polysaccharide portion of lipoteichoic acid (LTA)
C. Braun lipoprotein
D. Electron transport system components

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Question 38

Which of the following does not contain protein?

A. Pili
B. Flagellum
C. Lipoteichoic acid
D. Porin

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Question 39

The cell wall of

A. gram-positive bacteria are thicker than gram-negative bacteria
B. gram-negative bacteria are thicker than gram-positive bacteria
C. both have same thickness but composition is different
D. none of these

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Question 40

Which of the following is analogous to mesosomes of bacteria?

A. Mitochondria of eukaryotes
B. Golgi apparatus of eukaryotes
C. Lysosomes of eukaryotes
D. None of these

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Question 41

The other name for peptidoglycan is

A. mucopeptide
B. murein
C. both (a) & (b)
D. none of these

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Question 42

Peptidoglycan is also known as

A. N-acetyl muramic acid
B. murein mucopeptide
C. N acetylglucosamine
D. mesodiaminopimetic acid

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Question 43

Swimming towards a chemical of bacteria is termed as

A. positive chemotaxis
B. negative chemotaxis
C. phototaxis
D. magnetotaxis

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Question 44

Bacteria having no flagella are unable to

A. move
B. reproduce
C. stick to tissue surfaces
D. grow in nutrient agar

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Question 45

Which of the following bacterial genera (that produces endospore) have medical importance?

A. Clostridium
B. Bacillus
C. Both (a) and (b)
D. None of these

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Question 46

The arrangement, in which flagella are distributed all round the bacterial cell, is known as

A. lophotrichous
B. amphitrichous
C. peritrichous
D. monotrichous

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Question 47

The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as

A. lipase
B. lysozyme
C. pectinase
D. peroxidase

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Question 48

The protein from which hook and filaments of flagella are composed of, is

A. keratin
B. flagellin
C. gelatin
D. casein

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Question 49

Porins are located in

A. the outer membrane of gram-negative bacteria
B. the peptidoglycan layer of gram-positive bacteria
C. the cytoplasmic membrane of both gram-negative and gram-positive bacteria
D. the periplasmic space of gram-negative bacteria

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Question 50

Which of the following is true about cell wall of gram-positive bacteria?

A. It consists of multiple layers
B. It is thicker than that associated with gram-negative bacteria
C. It contains teichoic acids
D. All of these

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Question 51

In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cellwall?

A. Gram-positive bacteria
B. Gram-negative bacteria
C. Fungi
D. None of these

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Question 52

The structure responsible for motility of bacteria is

A. pilli
B. flagella
C. sheath
D. capsules

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Question 53

Genetic system is located in the prokaryotes in

A. nucleoid
B. chromatin
C. nuclear material
D. All of the above

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Question 54

The cocci which forms a chain is

A. Streptococci
B. diplococci
C. Staphylococci
D. Tetracocci

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Question 55

The next to last step in peptidoglycan biosynthesis is

A. synthesis of the NAM-peptide subunit
B. removal of the subunit from bactoprenol
C. linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
D. cross-linking the peptide side chains of peptidoglycan

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Question 56

Which of the following may contain fimbriae?

A. Gram-positive bacteria
B. Gram-negative bacteria
C. Both (a) and (b)
D. None of these

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Question 57

Teichoic acids are typically found in

A. cell walls of gram positive bacteria
B. outer membranes of gram positive bacteria
C. cell walls of gram negative bacteria
D. outer membranes of gram negative bacteria

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Question 58

Microcapsules are composed of

A. proteins
B. polysaccharides
C. lipids
D. all of these

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