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reactant of an enzyme-catalyzed reaction.

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protein catalyst that speeds up the rate of specific biological reactions.

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substance that speeds up the rate of a chemical reaction.

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compound with an amino group on one end and a carboxyl group on the other end.

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macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair.

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macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus.

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macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes.

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compound made up of carbon, hydrogen, and oxygen atoms; type of nutrient that is the major source of energy for the body.

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molecules composed of many monomers; makes up macromolecules.

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small chemical unit that makes up a polymer.

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a compound that produces hydroxide ions (OH-) in solution; a solution with a pH of more than 7.

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a compound that forms hydrogen ions (H+) in solution; a solution with a pH of less than 7.

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force of attraction between different kinds of molecules.

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Attraction between molecules of the same substance.

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Electrons on the outermost energy level of an atom.

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type of bond between atoms in which the electrons are shared.

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chemical bond formed when one or more electrons are transferred from one atom to another.

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atom that has a positive or negative charge.

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one of several forms of a single element, which contains the same number of protons but different numbers of neutrons.

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The basic unit of matter.