Bacteria Morphology – Section 1

36. In eukaryotic cells, ribosomes are

A. 70S
B. 60S
C. 80S
D. Not specific

Correct Answer: C. 80S

37. 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

Correct Answer: A. the outer membrane of gram-negative bacteria

38. 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

Correct Answer: A. O-antigen of lipopolysaccharide (LPS)

39. Which of the following does not contain protein?

A. Pili
B. Flagellum
C. Lipoteichoic acid
D. Porin

Correct Answer: C. Lipoteichoic acid

40. Swimming towards a chemical of bacteria is termed as

A. positive chemotaxis
B. negative chemotaxis
C. phototaxis
D. magnetotaxis

Correct Answer: A. positive chemotaxis

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