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Biology

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
active site   on an enzyme, the site that attaches to a substrate  
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ATP   adenosine triphosphate, an organic molecule that acts as the main energy source for cell processes; composed of a nitrogenous base, a sugar, and three phosphate groups  
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amino acid   a compound of a class of simple organic compounds that contain a carboxyl group and an amino group and that combine to form proteins  
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carbohydrate   a class of molecules that includes sugars, starches, and fiber; contains carbon, hydrogen, and oxygen  
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condensation reaction   a chemical reaction in which two or more molecules combine to produce water or another simple molecule  
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DNA   deoxyribonucleic acid, the material that contains the information that determines inherited characteristics  
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disaccharide   a sugar formed from two monosaccharides  
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enzyme   a molecule, either protein or RNA, that acts as a catalyst in biochemical reactions (catalyst is a type of enzyme)  
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fatty acid   an organic acid that is contained in lipids, such as fats or oils  
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functional group   the portion of a molecule that is active in a chemical reaction and that determines the properties of many organic compounds  
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hydrolysis   a chemical reaction between water and another substance to form two or more new substances; a reaction between water and a salt to create an acid or a base  
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lipid   a fat molecule or a molecule that has similar properties; examples include oils, waxes, and steroids  
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macromolecule   a very large organic molecule, usually a polymer, composed of hundreds or thousands of atoms  
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monomer   a simple molecule that can combine with other like or unlike molecules to make a polymer  
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monosaccharide   a simple sugar that is the basic subunit 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   a subunit (in a nucleic-acid chain) that consists of a sugar, a phosphate, and a nitrogenous base  
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organic compound   a covalently bonded compound that contains carbon, excluding carbonates and oxides  
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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 phosphorus and that is a structural component in cell membranes  
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polymer   a large molecule that is formed by more than five monomers, or small units  
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polypeptide a long chain of several amino acids   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 include 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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RNA   ribonucleic acid, 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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triglyceride   a lipid made of three fatty acid molecules and one glycerol molecule  
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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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