E-PolyLearning

161. Circular 'DNA' present in prokaryotes has molecular weight
a. 2 x 10^7
b. 2 x 10^8
c. 2 x 10^10
d. 2 x 10^9
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Answer: (d).2 x 10^9

162. In human tissues, adherence of bacteria, ultimately causes infection to humans, is mediated by the
a. Cell wall
b. Sugars
c. Capsule
d. Flagella
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Answer: (c).Capsule

163. Attachment of 'staphylococci' to 'mucosal' cells is mediated by
a. Sulphuric acid
b. Teichoic acid
c. Polysaccharides
d. Lipopolysaccharides
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Answer: (b).Teichoic acid

164. β lactamase is 'enzyme' that is present in
a. Cytoplasm
b. Cytosol
c. Ribosome
d. Periplasma
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Answer: (d).Periplasma