Bacteria Multiple Choice Questions and Answers

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

Answer: Mycoplasmas

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

Answer: All of the above

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3. 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
  1. glycosidic bond
  2. 1,4-glycosidic bond
  3. 1,6-glycosidic bond
  4. glycosidic bond

Answer: 1,4-glycosidic bond

4. Bacterial cells grown in a medium exposed to high osmotic pressure, changes shape from rod-shaped to __________ shaped.
  1. elongated
  2. irregular
  3. rod shaped
  4. spherical

Answer: spherical

5. Cellulose is degraded to cellobiose by the enzyme __________________
  1. cellulose dehydrogenase
  2. hexokinase
  3. beta-glucosidase
  4. cellulase

Answer: cellulase

6. In which of the following treatment involve oxidation of organic constituents of the wastewater?
  1. Final treatment
  2. Advanced treatment
  3. Secondary treatment
  4. Primary treatment

Answer: Secondary treatment

7. Which of the following microorganism produces dextran?
  1. Leuconostoc mesenteroides
  2. Streptomyces olivaceus
  3. Bacillus thuringiensis
  4. Bacillus polymyxa

Answer: Leuconostoc mesenteroides

8. Which of the following are true for cytoplasmic membrane?
  1. site of generation of protonmotive force
  2. hydrophilic barrier
  3. hydrophobic barrier
  4. hydrophobic barrier

Answer: hydrophobic barrier

9. Which of these is found on a gram-negative bacterium’s outer surface?
  1. Braun lipoprotein
  2. Polysaccharide portion of lipoteichoic acid (LTA)
  3. O- antigen of lipopolysaccharide (LPS)
  4. Components of Electron transport system

Answer:O- antigen of lipopolysaccharide (LPS)

10. Which of the following has Chinese letter arrangement?
  1. Clostridium Tetani
  2. Corynebacterium Diphtheriae
  3. Bacillus Anthracis
  4. Mycobacterium Tuberculosis

Answer: Corynebacterium Diphtheriae

11. Teichoic acids are basically found in
  1. Cell walls of the gram-positive bacteria
  2. Outer membrane of the gram-positive bacteria
  3. Outer membrane of the gram-negative bacteria
  4. Cell walls of the gram-negative bacteria

Answer: Cell walls of the gram-positive bacteria

12. The protein that makes up the hook and filaments of the flagella is called
  1. Keratin
  2. Gelatin
  3. Flagellin
  4. Casein

Answer: Flagellin

13. Lipopolysaccharide is a key element of the cell-wall’s outer membrane in which of the following?
  1. Gram-Negative Bacteria
  2. Gram-Positive Bacteria
  3. Fung
  4. None of these

Answer: Gram-Negative Bacteria

14. The analogous to mesosomes of the bacteria is
  1. Golgi apparatus of the Eukaryotes
  2. Lysosomes of the Eukaryotes
  3. Mitochondria of the Eukaryotes
  4. None of these

Answer: Mitochondria of the Eukaryotes

15. The enzyme which may easily damage the cell walls of various gram – positive bacteria is termed as
  1. Lipase
  2. Pectinase
  3. Lysozyme
  4. Peroxidase

Answer: Lysozyme

16. What is a cluster of polar flagella called?
  1. Petritrichous
  2. Monotrichous
  3. Amphitrichous
  4. Lophotrichous

Answer: Lophotrichous

17. This is analogous to mesosomes of bacteria
  1. Golgi apparatus of eukaryotes
  2. Lysosomes of eukaryotes
  3. Mitochondria of eukaryotes
  4. None of the above

Answer: Mitochondria of eukaryotes

18. The synthesis of new membrane material during reproduction in Gram-positive cells is performed by which of the following organelles?
  1. Nucleus
  2. Mesosome
  3. Endoplasmic Reticulum
  4. Cytoplasmic membrane

Answer: Mesosome

19. A bleb or fold like formation occurs in which of the following bacteria?
  1. Rhodopseudomonas acidophila
  2. Bacillus subtilis
  3. E.coli
  4. Streptococcus faecalis

Answer: E.coli

20. Rhodopseudomonas acidophila reproduces by which of the following methods?
  1. Binary fission
  2. Budding
  3. Fragmentation
  4. Sporulation

Answer: Budding

21. The synthesis of new membrane material during reproduction in Gram-positive cells is performed by which of the following organelles?
  1. Nucleus
  2. Mesosome
  3. Endoplasmic Reticulum
  4. Cytoplasmic membrane.

Answer:Mesosome

22. Tyrocidines are more effective against ___________________
  1. Gram-negative organisms
  2. Gram-positive organisms
  3. Spirochetes
  4. Mycoplasmas

Answer: Gram-positive organisms

23. Sulphates are reduced to hydrogen sulphide by _____________________
  1. Thiobacillus thiooxidans
  2. Rhodospirillum
  3. Desulfotomaculum sp.
  4. Photosynthetic sulfur bacteria

Answer: Desulfotomaculum sp.

24. Acridine orange is which type of mutagen?
  1. chemical compounds
  2. transposons
  3. base analog
  4. intercalating agents

Answer: intercalating agents

25. Which of the following is true about gram-negative bacteria?
  1. Cell wall made up of various layers
  2. Cell wall made up of teichoic acids
  3. The cell wall is thicker as compared to the related gram-negative bacteria
  4. All the above

Answer: All the above

26. Chemotaxis is a
  1. Moving in the direction of a bacteria
  2. Swimming away of the bacteria
  3. Swimming towards or away from a bacteria in the presence of a chemical substance
  4. None of the above

Answer: Swimming towards or away from a bacteria in the presence of a chemical substance

27. The genetic system is found in prokaryotes in
  1. Nucleoid
  2. Chromatin
  3. Nuclear Material
  4. All of the above

Answer: All of the above

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

Answer: Diplococci

29. Which of the following bacterial species divides by fragmentation?
  1. Bacillus subtilis
  2. Streptococcus faecalis
  3. Rhodopseudomonas acidophila
  4. Nocardia sp.

Answer: Nocardia sp.

30. Bacterial cell grown on hydrocarbon wastes from the petroleum industry are a source of _____________
  1. fats
  2. vitamins
  3. carbohydrates
  4. proteins

Answer: proteins

31. Which of the following bacteria is resistant to penicillin since it lacks a cell wall?
  1. Spirochetes
  2. Mycoplasmas
  3. Cyanobacteria
  4. Bdellovibrios

Answer: Mycoplasmas

32. Growth of bacteria or microorganisms refer to
  1. an increase in the size of an individual organism
  2. an increase in the mass of an individual organism
  3. changes in the total population
  4. an increase in number of cells

Answer: an increase in number of cells

33. Which among the following group of microorganisms are found in the ducts of cow’s mammary glands?
  1. Micrococci
  2. Microbacteria
  3. Lactobacilli
  4. Coliforms

Answer: Micrococci

34. Which of the following yeast can be used to produce microbial protein?
  1. Eremothecium ashbyi
  2. Candida utilis
  3. Saccharomyces cerevisiae
  4. Candida milleri

Answer: Candida utilis

35. Flagella in bacteria enable bacteria to
  1. reproduce
  2. locomote
  3. Adhere to the tissue surfaces
  4. Thrive in the nutrient agar

Answer: locomote

36. Sterols are found in the cytoplasmic membrane of which of the following organisms?
  1. Mycoplasma
  2. Clostridium
  3. Proteus
  4. Bacillus

Answer: Mycoplasma

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

Answer: locomote

38. Growth of bacteria or microorganisms refer to __________________
  1. an increase in the size of an individual organism
  2. an increase in the mass of an individual organism
  3. changes in the total population
  4. an increase in number of cells

Answer: an increase in number of cells

39. Equatorial ridge formation in the cell wall takes place in which of the following bacteria?
  1. Streptomyces sp.
  2. Bacillus subtilis
  3. Streptococcus faecalis
  4. Escherichia coli

Answer: Streptococcus faecalis

40. Which was the first disease for which a chemotherapeutic agent was used?
  1. Small pox
  2. Syphilis
  3. AIDS
  4. Malaria

Answer: Syphilis

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