*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
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