🧪 Zoology MCQ Quiz Hub

1. Which of this bacteria is resistant to penicillin as it lacks a cell wall?
Spirochetes
Cyanobacteria
 Mycoplasmas
Bdellovibrios

2. What is a cluster of polar flagella called?
 Petritrichous
Monotrichous
Amphitrichous
 Lophotrichous

3. Which of these is a cocci occurring in single or pairs?
 Diplococci
Streptococci
Tetracocci
None of the above

4. Flagella in bacteria enable them to
reproduce
 locomote
Thrive in nutrient agar
Adhere to tissue surfaces

5.  This about cell wall of gram-positive bacteria is true
cell wall comprises of many layers
the cell wall is thicker than the associated gram-negative bacteria
Cell wall comprises of teichoic acids
All of the above

6. What is Chemotaxis?
Swimming towards a bacteria
 Swimming away of a bacteria
In the presence of a chemical compound, swimming towards or away of a bacteria
None of these

7.  Which of these is exposed on the outer surface of a gram-negative bacterium?
Braun lipoprotein
O-antigen of lipopolysaccharide (LPS)
Polysaccharide portion of lipoteichoic acid (LTA)
Electron transport system components

8. The covalent bond which links the cell walls of gram-positive bacteria containing two modified sugars – N – acetylmuramic acid (NAM) and N-acetyl glucosamine (NAG) is
glycosidic bond
1,4-glycosidic bond
 1,6-glycosidic bond
glycosidic bond

9.  Which one of these has a Chinese letter arrangement?
Clostridium tetani
Mycobacterium tuberculosis
Bacillus anthracis
Corynebacterium diphtheriae

10. This is analogous to mesosomes of bacteria
Golgi apparatus of eukaryotes
Lysosomes of eukaryotes
Mitochondria of eukaryotes
None of the above

11. Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?
Cyanobacteria
Mycoplasmas
Bdellovibrios
Spirochetes

12. A cluster of polar flagella is called
lophotrichous
amphitrichous
monotrichous
petritrichous

13. Flagella move the cell by
many flagella beating in a synchronous, whip-like motion
an individual flagellum beating in a whip-like motion
spinning like a propeller
attaching to nearby particles and contracting

14. he protein from which hook and filaments of flagella are composed of, is
keratin
flagellin
gelatin
casein

15. The cooci which mostly occur in single or pairs are
Streptococci
Diplococci
Tetracocci
None of these

16. Which of the following may contain fimbriae?
Gram-positive bacteria
Gram-negative bacteria
Both (a) and (b)
None of these

17. Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria
50% or more
About 10%
11%+ 0.22%
About 20%

18. Bacteria having no flagella are unable to
move
reproduce
stick to tissue surfaces
grow in nutrient agar

19. Which of the following is true about cell wall of gram-positive bacteria?
It consists of multiple layers
It is thicker than that associated with gram-negative bacteria
It contains teichoic acids
All of these

20. The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as
lipase
lysozyme
pectinase
peroxidase

21. The cell wall of
gram-positive bacteria are thicker than gram-negative bacteria
gram-negative bacteria are thicker than gram-positive bacteria
both have same thickness but composition is different
none of these

22. Peptidoglycan is also known as
N-acetyl muramic acid
murein mucopeptide
N acetylglucosamine
mesodiaminopimetic acid

23. Genetic system is located in the prokaryotes in
nucleoid
chromatin
nuclear material
all of these

24. Which is most likely to be exposed on the surface of a gram-negative bacterium?
Pore protein (porin)
Protein involved in energy generation
Lipoteichoic acid
Phospholipids

25. The last step in synthesis of peptidoglycan is
attachment of a peptide to muramic acid
attaching two amino acids to form a cross-link
attachment of a portion of peptidoglycan to a membrane lipid
binding of penicillin to a membrane protein

26. Cytoplasmic inclusions include
ribosomes
mesosomes
fat globules
all of these

27. The cocci which forms a bunch and irregular pattern are
Staphylococci
diplococci
Tetracocci
Streptococci

28. Chemotaxis is a phenomenon of
swimming away of bacteria
swimming towards a bacteria
swimming away or towards of bacteria in presence of chemical compound
none of the above

29. The structure responsible for motility of bacteria is
pilli
flagella
sheath
capsules

30. The next to last step in peptidoglycan biosynthesis is
synthesis of the NAM-peptide subunit
removal of the subunit from bactoprenol
linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
cross-linking the peptide side chains of peptidoglycan

31. The cocci which forms a chain is
Streptococci
diplococci
Staphylococci
Tetracocci

32. The arrangement, in which flagella are distributed all round the bacterial cell, is known as
lophotrichous
amphitrichous
peritrichous
monotrichous

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

34. Which of the following has peptidoglycan as a major constituent of cell wall?
Gram-negative bacteria
Gram-positive bacteria
Fungi
None of these

35. The common word for bacteria which are helically curved rods is
cooci
pleomorphic
bacillus
spirilla

36. The bacteria deficient in cell wall is
Treponema
Mycoplasma
Staphylococcus
Klebsiella

37. Which of the following is not true about peptidoglycan?
It is a polymer consisting of N-acetyl glucosamine, N-acetyl muramic acid and amino acids (alanine, lysine, etc.)
It is present in prokaryotic cell wall
It occurs in the form of a bag shaped macro molecule surrounding the cytoplasm membrane
None of the above

38. The common word for bacteria which are spherical in shape is
cocci
bacilli
spirilla
pleomorphic

39. Single or clusters of flagella at both poles is known as
monotrichous
petritrichous
petritrichous
none of these

40. Which of the following bacterial genera (that produces endospore) have medical importance?
Clostridium
Bacillus
Both (a) and (b)
None of these

41. Microcapsules are composed of
proteins
polysaccharides
lipids
all of these

42. Gram positive cells have a
second outer membrane that helps to retain the crystal violet stain
multiple layer of peptidoglycan that helps to retain the crystal violet stain
thick capsule that traps the crystal violet stain
periplasmic space that traps the crystal violet

43. The common word for bacteria which are straight rod in shape is
cooci
bacilli
spirilla
pleomorphic

44. A single polar flagella is known as
monotrichous
lophotrichous
amphitrichous
none of these

45. Teichoic acids are typically found in
cell walls of gram positive bacteria
outer membranes of gram positive bacteria
cell walls of gram negative bacteria
outer membranes of gram negative bacteria

46. In eukaryotic cells, ribosomes are
70S
60S
80S
Not specific

47. Porins are located in
the outer membrane of gram-negative bacteria
the peptidoglycan layer of gram-positive bacteria
the cytoplasmic membrane of both gram-negative and gram-positive bacteria
the periplasmic space of gram-negative bacteria

48. Which of the following is exposed on the outer surface of a gram-negative bacterium?
O-antigen of lipopolysaccharide (LPS)
Polysaccharide portion of lipoteichoic acid (LTA)
Braun lipoprotein
Electron transport system components

49. Which of the following does not contain protein?
Pili
Flagellum
Lipoteichoic acid
Porin

50. Swimming towards a chemical of bacteria is termed as
positive chemotaxis
negative chemotaxis
phototaxis
magnetotaxis

51. Chemically the capsule may be
polypeptide
polysaccharide
either (a) or (b)
none of these

52. Peptidoglycan is found only in the bacterial
cell membrane
glycocalyx
cell wall
spore

53. 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
α- 1,4-glycosidic bond
β-1,6-glycosidic bond
α- 1,6-glycosidic bond
β- 1,4-glycosidic bond

54. Which of the following organism has sterols in their cytoplasmic membrane?
Clostridum
Proteus
Mycoplasma
Bacillius

55. Name the component of flagellum.
Filament
Hook
Basal body
All of these

56. The location where the bacterial chromosome concentrates is called
nucleus
nuclein
nucleoid
nucleose

57. Which of the following is analogous to mesosomes of bacteria?
Mitochondria of eukaryotes
Golgi apparatus of eukaryotes
Lysosomes of eukaryotes
None of these

58. Which of the following has Chinese letter arrangement?
Bacillus anthracis
Mycobacterium tuberculosis
Clostridium tetani
Corynebacterium diphtheriae

59. The other name for peptidoglycan is
mucopeptide
murein
both (a) & (b)
none of these

60. Cyanobacteria have
a gram-positive cell wall
a gram-negative cell wall
Neither (a) nor (b)
No cell wall

61. In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cellwall?
Gram-positive bacteria
Gram-negative bacteria
Fungi
None of these

62. Which of the following structure(s) is /are external to cell wall?
Flagella
Stalks
Sheath
All of these

63. Which of the following may be most likely to be missing from a gram-positive bacterium?
Penicillin binding protein
Peptidoglycan
Lipopolysaccharide
Phospholipid bilayer membrane