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
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Hydrogen sulfide
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.
Skin color comes from the pigment
a. melatonin. b. melanin. c. anthocyanin. d. giberellin. e. fucoxanthin.
An individual plant is often more difficult to recognize than an individual animal
Indicate whether the statement is true or false
The most abundant antibody class in the body, found in all body fluids, is
A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.