A nucleotide is composed of at least one sugar, one phosphate group, and ____
a. one nitrogen-containing base
b. one amino acid
c. multiple cholesterol molecules
d. fatty acid chains
e. ATP
ANSWER: a
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Determination ____, while differentiation ____
a. is a cell's commitment to a developmental fate; is a cell's development into specialized cell types b. is a cell's development into specialized cell types; is a cell's commitment to a developmental fate c. is permanent; is reversible d. is a result of a cell's own genetic program; is a result of influence by other cells e. results in the final fate of a cell; results in determination
How do the flagella of bacteria differ from the flagella of archaea?
A) Archaeal flagella are thinner than bacterial flagella. B) Bacterial flagella cannot rotate. C) Bacterial flagella are used for reproduction. D) Bacterial flagella occur at only one end of the cell. E) The flagella of archaea are scattered over the cell surface.
The substances to the right of the arrow in a statement of a chemical reaction are the
A. metabolites. B. substrates. C. products. D. reactants.
The portion of an enzyme that binds specially to the substrate or substrates is referred to as the _____ of the enzyme.
Fill in the blank(s) with the appropriate word(s).