If the differently shaded portions of this molecule represent different polypeptide chains, then this

figure is representative of:

a. an amino acid.

b. the quaternary structure of a protein.

c. a steroid hormone.

d. cellulose.

e. a carotenoid.


B

Biology & Microbiology

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Obligate anaerobes are usually poisoned by molecular oxygen but may grow in aerobic habitats if associated with facultative anaerobes that use up all available oxygen.

Answer the following statement true (T) or false (F)

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What maintains the resting membrane potential?

a. Na+-K+ pumps b. leaky sodium channels c. gated sodium channels d. leaky potassium channels e. gated potassium channels

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Which one of the following occurs when a phosphate is removed from an ATP molecule?

A) Energy is added to the ATP molecule to form ADP. B) Oxygen produced in the reaction causes the molecule to explode. C) Energy is released for cell work. D) Chemical reactions stop in a cell due to lack of an energy source. E) Fat is converted to protein.

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In pea plants, the allele for purple flowers (P) is dominant to the allele for white flowers (p). In a cross between a purple-flowered plant and a white-flowered plant, all 73 of the offspring plants had purple flowers

Which cross would provide such results? A) pp × pp B) Pp × Pp C) PP × PP D) PP × pp

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