Human cells require ____ vitamins at a

minimum.
a. 5
b. 8
c. 10
d. 13
e. 20


D

Biology & Microbiology

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The membranes of eukaryotes and mycoplasma

A. contain peptidoglycan. B. contain sterols for "strength." C. contain ergosterol. D. are fixed static structures.

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The conversion of nitrate (NO3-) to nitrogen gas (N2) is called ________.

A. ammonification B. nitrogen fixation C. photosynthesis D. nitrification E. denitrification

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Speciation caused by a change in the course of a river is an example of ____ speciation

a. divergent b. parapatric c. allopatric d. convergent e. sympatric

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One characteristic shared by sucrose, lactose, and maltose is that _____.

A. they are all polysaccharides B. they are all monosaccharides C. they are all disaccharides D. they all contain fructose E. they are all indigestible by humans

Biology & Microbiology