36. In eukaryotic cells, ribosomes are

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

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

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

39. Which of the following does not contain protein?

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

40. Swimming towards a chemical of bacteria is termed as

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