Which of the following describes the composition of a nucleotide?

a. a five-carbon sugar, a phosphate group, and one of four amino acids
b. a five-carbon sugar, a nitrogenous base, and one of twenty amino acids
c. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases
d. a six-carbon sugar, a phosphate group, and one of twenty amino acids


Answer: c. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases

Biology & Microbiology

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A. is produced when sulfur compounds are used as terminal electron acceptors. B. may react with iron to produce a black precipitate. C. is produced by Desulfovibrio. D. has a rotten egg smell. E. All of the choices are correct.

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Skin color comes from the pigment

a. melatonin. b. melanin. c. anthocyanin. d. giberellin. e. fucoxanthin.

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An individual plant is often more difficult to recognize than an individual animal

Indicate whether the statement is true or false

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The most abundant antibody class in the body, found in all body fluids, is

A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

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