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*Which of the following statements is true? a. peptidoglycan is comprised of cross-linked fatty acids b. the...

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Biology

*Which of the following statements is true?

a. peptidoglycan is comprised of cross-linked fatty acids

b. the cell walls of most bacteria are composed ofpeptidoglycan

c. Gram-negative bacteria have a relatively thick layer ofpeptidoglycan

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

e. answers (a) and (b) are both correct

* The cell membrane of bacteria

a. is semi-permeable.

b. is usually a lipid bilayer

c. prevents cell lysis due to high intracellular osmoticpressure

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

* A bacterial species has a generation time of 15 minutes and isgrowing exponentially. If there are 2 cells initially how manycells are there after 90 minutes?

a. 256 b. 128 c. 64 d. 32 e. none of the above

*Most bacterial cells reproduce by

a. the budding of daughter cells from a mother cell

b. forming spores that later germinate

c. binary fission

d. production of gametes and sexual reproduction

  

Answer & Explanation Solved by verified expert
4.5 Ratings (821 Votes)
1 Peptidoglycan is found in the cell wall of bacteria and is made of sugars and amino acids Nacetyl glucosamine and Nacetyl muramic acid Gram positive bacteria have a thick peptidoglycan layer when compared to Gram negative bacteria So the correct option is option    See Answer
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