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CATALYSTS

a substance that changes the rate of a chemical reaction without being consumed or changed significantly.

PROTEINS

Organic compounds composed mainly of carbon, hydrogen, oxygen, and nitrogen.

SUBSTRATE

a part, substance, or element that lies beneath and supports another part, substance, or element; the reactant in reactions catalyzed by enzymes

PRODUCTS

elements or compounds produced by a chemical reaction.

REACTANTS

elements or compounds that enter into a chemical reaction.

ACTIVATION ENERGY

the amount of energy needed to get reaction started.

AMINO ACIDS

an organic molecule that contains a carboxyl and an amino group that makes up proteins; a protein monomer

FATTY ACIDS

an organic acid that is contained in lipids, such as fats or oils.

LIPIDS

a large, nonpolar organic molecule, including fats and steroids; lipids store energy and make up cell membranes.

NUCLEIC ACIDS

an organic compound, either RNA or DNA, whose molecules are made up of one or two chains of nucleotides and carry genetic information

NUCLEOTIDES

in a nucleic-acid chain, a subunit that contains of sugar, a phosphate, and a nitrogenous base

CARBOHYDRATES

any organic compound that is made up of carbon, hydrogen, and oxygen, and that provides nutrients to the cells of living things