E-PolyLearning

26. Gram-negative bacteria are more resistant to antibiotics due to the presence of?
a. Thin peptidoglycan wall
b. Outer lipopolysaccharide layer
c. Porin proteins
d. Teichoic acid
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Answer: (b).Outer lipopolysaccharide layer

27. Which of the following are present in teichoic acids?
a. ribitol residues
b. glycerol residues
c. glucose residues
d. ribitol or glycerol residues
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Answer: (d).ribitol or glycerol residues

28. Bayer’s junctions are sites which help in joining which of the following?
a. cytoplasmic membrane and outer membrane
b. outer membrane and capsule
c. cytoplasmic membrane and periplasmic space
d. peptidoglycan layer and cytoplasmic membrane
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Answer: (a).cytoplasmic membrane and outer membrane

29. Polyisoprenoid branched-chain lipids, are present in which of the following?
a. Archaebacteria
b. Eubacteria
c. Archaebacteria and Eubacteria
d. Cannot be determined
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Answer: (a).Archaebacteria

30. Cytoplasmic membrane and the cell material bounded by it plus the outer membrane of cell is known as _________
a. Protoplast
b. Cytoplast
c. Spheroplast
d. Cell membrane
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Answer: (c).Spheroplast

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