E-PolyLearning

21. Cord factor is a ___________
a. protein
b. teichoic acid derivative
c. mycolic acid derivative
d. carbohydrate
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Answer: (c).mycolic acid derivative

22. The outer membarane of the Gram-negative cell wall is anchored to the underlying peptidoglycan by means of which of the following?
a. Braun’s Lipoprotein
b. Phospholipids
c. Proteins
d. Lipopolysaccharide
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Answer: (a).Braun’s Lipoprotein

23. Which among the following acts as receptors for bacteriophage attachment in Gram-negative bacteria?
a. Cilia
b. O antigens
c. Lipid A
d. Teichoic acid
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Answer: (b).O antigens

24. Porins are special proteins act as channels in outer membrane of Gram-negative bacteria.
a. True
b. False
c. May be
d. Can't say
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Answer: (a).True

25. NAG and NAM of peptidoglycan layer is linked by _________
a. beta-(1,4) glycosidic linkage
b. alpha-(1,4) glycosidic linkage
c. alpha-(1,6) glycosidic linkage
d. beta-(1,6) glycosidic linkage
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Answer: (a).beta-(1,4) glycosidic linkage

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