| 126. | Porins are located in |
| a. | the outer membrane of gram-negative bacteria |
| b. | the peptidoglycan layer of gram-positive bacteria |
| c. | the cytoplasmic membrane of both gram-negative and gram-positive bacteria |
| d. | the periplasmic space of gram-negative bacteria |
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Answer: (a).the outer membrane of gram-negative bacteria
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| 127. | Which of the following is exposed on the outer surface of a gram-negative bacterium? |
| a. | O-antigen of lipopolysaccharide (LPS) |
| b. | Polysaccharide portion of lipoteichoic acid (LTA) |
| c. | Braun lipoprotein |
| d. | Electron transport system components |
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Answer: (a).O-antigen of lipopolysaccharide (LPS)
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| 128. | Which of the following does not contain protein? |
| a. | Pili |
| b. | Flagellum |
| c. | Lipoteichoic acid |
| d. | Porin |
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Answer: (c).Lipoteichoic acid
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| 129. | Swimming towards a chemical of bacteria is termed as |
| a. | positive chemotaxis |
| b. | negative chemotaxis |
| c. | phototaxis |
| d. | magnetotaxis |
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Answer: (a).positive chemotaxis
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| 130. | Chemically the capsule may be |
| a. | polypeptide |
| b. | polysaccharide |
| c. | either (a) or (b) |
| d. | none of these |
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Answer: (c).either (a) or (b)
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