*Which of the following statements is true? a. the cell walls of most bacteria a

ID: 194845 • Letter: #

Question

*Which of the following statements is true?

a. the cell walls of most bacteria are composed of peptidoglycan

b. peptidoglycan is a fatty acid

c. Gram-positive bacteria have a relatively thin layer of peptidoglycan

d. peptidoglycan is found mainly in the cell walls of fungi, algae and plants

e. answers (a) and (c) are correct

*Gram positive bacteria

a. have a thick cell wall, which retains the crystal violet dye when cells are Gram stained

b. contain teichoic acid in their cell walls

c. appear purple when Gram stained

d. all the above e. none of the above

*The cell envelope of Gram negative bacteria

a. includes a thick cell wall

b. includes both an inner and outer membrane

c. includes a peptidoglycan layer

d. always includes a capsule made of polysaccharides

e. answers (b) and (c) are correct

*The cell membrane of bacteria

a. is semi-permeable

b. is usually a lipid bilayer

c. prevents cell lysis due to high intracellular osmotic pressure

d. answers (a) and (b) are correct e. answers (a) and (c) are correct

Q. Which of the following statements is true?

Ans. (a) the cell walls of most bacteria are composed of peptidoglycan.

Q. Gram positive bacteria

Ans. (d) all the above

Q. The cell envelope of Gram negative bacteria

Ans. (b) includes both an inner and outer membrane.

Q. The cell membrane of bacteria

Ans. (d) answers (a) and (b) are correct

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