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Vocab for 3.2 Biology

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Term
Definition
Active Site   The site on an enzyme that attaches to a substrate  
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Amino Acid   An organic molecule that contains a carboxyl and an amino group and that makes up proteins; a protein monomer  
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Carbohydrate   An organic compound that is made of carbon, hydrogen, and oxygen and that provides nutrients to the cells of living things  
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Deoxyribonucleic Acid (DNA)   The information that directs the characteristics of an organism and directs its cell activities  
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Disaccharide   A sugar formed from two monosaccharides  
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Enzyme   A type of protein or RNA molecule that speeds up metabolic reactions in plants and animals without being permanently changed or destroyed  
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Fatty Acid   An organic acid that is contained in lipids, such as fats or oils  
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Lipid   A large, nonpolar organic molecule, including fats and steroids; lipids store energy and make up cell membranes  
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Monosaccharide   A simple sugar that is the basic subunit, or monomer, of a carbohydrate  
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Nucleic Acid   An organic compound, either RNA or DNA, whose molecules are made up of one or two chains of nucleotides and carry genetic information  
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Nucleotide   In a nucleic-acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogenous base  
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Peptide Bond   The chemical bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid  
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Phospholipid   A lipid that contains phosphorous and that is a structural component in cell membranes  
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Polypeptide   A long chain of several amino acids  
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Polysaccharide   One of the carbohydrates made up of long chains of simple sugars; polysaccharides including starch, cellulose, and glycogen  
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Protein   An organic compound that is made of one or more chains of amino acids and that is a principal component of all cells  
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Ribonucleic Acid (RNA)   A natural polymer that is present in all living cells and that plays a role in protein synthesis  
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Steroid   A type of lipid that consists of four carbon rings to which various functional groups are attached and that usually has a physiological action  
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Substrate   A part, substance, or element that lies beneath and supports another part, substance, or element; the reactant in reactions catalyzed by enzymes  
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Wax   A type of structural lipid consisting of a long fatty-acid chain that is joined to a long alcohol chain  
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