Deep ocean organisms expend little energy to stay afloat because
a. they have air bladders.
b. they have a high oil content.
c. of their small size.
d. they are the same density as the surrounding environment.
e. their metabolism is high.
D
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Which of the following statements about nucleotides is (are) true?
A) A nucleotide contains a nitrogenous base. B) A nucleotide contains a pentose. C) A nucleotide contains a phosphate group. D) All of the above statements are true.
A(n) _____ is an organized series of reaction steps in which membrane-bound arrays of enzymes and other molecules give up and accept electrons in turn
a. cyclic metabolic pathway b. endergonic reaction c. electron transfer chain d. concentration gradient e. passive transport
Flatworms have _______ nerve cords that run the length of their bodies, while nemotodes have _____.
a. one, two b. two, three c. two, four d. one, four
If a sperm cell combines with an egg cell, then the result is a
A. gamete. B. diploid cell. C. duplicated chromosome. D. gametophyte. E. haploid cell.