Bacteria Multiple Choice Questions and Answers
1. Which of this bacteria is resistant to penicillin as it lacks a cell wall?
- Spirochetes
- Cyanobacteria
- Mycoplasmas
- Bdellovibrios
Answer: Mycoplasmas
2. 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
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
- glycosidic bond
- 1,4-glycosidic bond
- 1,6-glycosidic bond
- 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.
- elongated
- irregular
- rod shaped
- spherical
Answer: spherical
5. Cellulose is degraded to cellobiose by the enzyme __________________
- cellulose dehydrogenase
- hexokinase
- beta-glucosidase
- cellulase
Answer: cellulase
6. In which of the following treatment involve oxidation of organic constituents of the wastewater?
- Final treatment
- Advanced treatment
- Secondary treatment
- Primary treatment
Answer: Secondary treatment
7. Which of the following microorganism produces dextran?
- Leuconostoc mesenteroides
- Streptomyces olivaceus
- Bacillus thuringiensis
- Bacillus polymyxa
Answer: Leuconostoc mesenteroides
8. Which of the following are true for cytoplasmic membrane?
- site of generation of protonmotive force
- hydrophilic barrier
- hydrophobic barrier
- hydrophobic barrier
Answer: hydrophobic barrier
9. Which of these is found on a gram-negative bacterium’s outer surface?
- Braun lipoprotein
- Polysaccharide portion of lipoteichoic acid (LTA)
- O- antigen of lipopolysaccharide (LPS)
- Components of Electron transport system
Answer:O- antigen of lipopolysaccharide (LPS)
10. Which of the following has Chinese letter arrangement?
- Clostridium Tetani
- Corynebacterium Diphtheriae
- Bacillus Anthracis
- Mycobacterium Tuberculosis
Answer: Corynebacterium Diphtheriae
11. Teichoic acids are basically found in
- Cell walls of the gram-positive bacteria
- Outer membrane of the gram-positive bacteria
- Outer membrane of the gram-negative bacteria
- 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
- Keratin
- Gelatin
- Flagellin
- Casein
Answer: Flagellin
13. Lipopolysaccharide is a key element of the cell-wall’s outer membrane in which of the following?
- Gram-Negative Bacteria
- Gram-Positive Bacteria
- Fung
- None of these
Answer: Gram-Negative Bacteria
14. The analogous to mesosomes of the bacteria is
- Golgi apparatus of the Eukaryotes
- Lysosomes of the Eukaryotes
- Mitochondria of the Eukaryotes
- 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
- Lipase
- Pectinase
- Lysozyme
- Peroxidase
Answer: Lysozyme
16. What is a cluster of polar flagella called?
- Petritrichous
- Monotrichous
- Amphitrichous
- Lophotrichous
Answer: Lophotrichous
17. This is analogous to mesosomes of bacteria
- Golgi apparatus of eukaryotes
- Lysosomes of eukaryotes
- Mitochondria of eukaryotes
- 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?
- Nucleus
- Mesosome
- Endoplasmic Reticulum
- Cytoplasmic membrane
Answer: Mesosome
19. A bleb or fold like formation occurs in which of the following bacteria?
- Rhodopseudomonas acidophila
- Bacillus subtilis
- E.coli
- Streptococcus faecalis
Answer: E.coli
20. Rhodopseudomonas acidophila reproduces by which of the following methods?
- Binary fission
- Budding
- Fragmentation
- Sporulation
Answer: Budding
21. The synthesis of new membrane material during reproduction in Gram-positive cells is performed by which of the following organelles?
- Nucleus
- Mesosome
- Endoplasmic Reticulum
- Cytoplasmic membrane.
Answer:Mesosome
22. Tyrocidines are more effective against ___________________
- Gram-negative organisms
- Gram-positive organisms
- Spirochetes
- Mycoplasmas
Answer: Gram-positive organisms
23. Sulphates are reduced to hydrogen sulphide by _____________________
- Thiobacillus thiooxidans
- Rhodospirillum
- Desulfotomaculum sp.
- Photosynthetic sulfur bacteria
Answer: Desulfotomaculum sp.
24. Acridine orange is which type of mutagen?
- chemical compounds
- transposons
- base analog
- intercalating agents
Answer: intercalating agents
25. Which of the following is true about gram-negative bacteria?
- Cell wall made up of various layers
- Cell wall made up of teichoic acids
- The cell wall is thicker as compared to the related gram-negative bacteria
- All the above
Answer: All the above
26. Chemotaxis is a
- Moving in the direction of a bacteria
- Swimming away of the bacteria
- Swimming towards or away from a bacteria in the presence of a chemical substance
- 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
- Nucleoid
- Chromatin
- Nuclear Material
- All of the above
Answer: All of the above
28. Which of these is a cocci occurring in single or pairs?
- Diplococci
- Streptococci
- Tetracocci
- None of the above
Answer: Diplococci
29. Which of the following bacterial species divides by fragmentation?
- Bacillus subtilis
- Streptococcus faecalis
- Rhodopseudomonas acidophila
- Nocardia sp.
Answer: Nocardia sp.
30. Bacterial cell grown on hydrocarbon wastes from the petroleum industry are a source of _____________
- fats
- vitamins
- carbohydrates
- proteins
Answer: proteins
31. Which of the following bacteria is resistant to penicillin since it lacks a cell wall?
- Spirochetes
- Mycoplasmas
- Cyanobacteria
- Bdellovibrios
Answer: Mycoplasmas
32. Growth of bacteria or microorganisms refer to
- an increase in the size of an individual organism
- an increase in the mass of an individual organism
- changes in the total population
- 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?
- Micrococci
- Microbacteria
- Lactobacilli
- Coliforms
Answer: Micrococci
34. Which of the following yeast can be used to produce microbial protein?
- Eremothecium ashbyi
- Candida utilis
- Saccharomyces cerevisiae
- Candida milleri
Answer: Candida utilis
35. Flagella in bacteria enable bacteria to
- reproduce
- locomote
- Adhere to the tissue surfaces
- Thrive in the nutrient agar
Answer: locomote
36. Sterols are found in the cytoplasmic membrane of which of the following organisms?
- Mycoplasma
- Clostridium
- Proteus
- Bacillus
Answer: Mycoplasma
37. Flagella in bacteria enable them to
- reproduce
- locomote
- Thrive in nutrient agar
- Adhere to tissue surfaces
Answer: locomote
38. Growth of bacteria or microorganisms refer to __________________
- an increase in the size of an individual organism
- an increase in the mass of an individual organism
- changes in the total population
- 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?
- Streptomyces sp.
- Bacillus subtilis
- Streptococcus faecalis
- Escherichia coli
Answer: Streptococcus faecalis
40. Which was the first disease for which a chemotherapeutic agent was used?
- Small pox
- Syphilis
- AIDS
- Malaria
Answer: Syphilis
