E-PolyLearning

31. Which among the following is associated with export of exocellular enzymes?
a. central mesosomes
b. peripheral mesosomes
c. thylakoids
d. nucleus
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Answer: (b).peripheral mesosomes

32. Ribosomes of prokaryotes have a sedimentation coefficient of?
a. 90S
b. 80S
c. 50S
d. 70S
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Answer: (d).70S

33. Poly-beta-hydroxybutyrate(PHB) present in aerobic bacteria can serve as?
a. a reserve carbon and energy source
b. a reserve source of phosphate
c. acceptor of oxygen
d. provides buoyancy
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Answer: (a).a reserve carbon and energy source

34. Which among the following compound when added to cytoplasmic membrane helps in maintaining the rigidity of cell?
a. lipopolysaccharide
b. hopanoid
c. phosphoglycerides
d. amino acids
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Answer: (b).hopanoid

35. The nucleoid can be made visible under the light microscope by _________
a. Methylene blue
b. Iodine
c. Nile blue
d. Feulgen staining
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Answer: (d).Feulgen staining