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Biology Chapter 5 Vocab
Johnson
30
Science
9th Grade
10/08/2008

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Term
Polypeptide
Definition
Chain of linked amino acids.
Term
Activation energy
Definition
Minimum amount of energy required to trigger a chemical rection.
Term
Active site
Definition
Region of an enzyme into which a particular substrate fits.
Term
Enzyme
Definition
Specialized protein that catalyzes the chemical reactions of a cell.
Term
Substrate
Definition
Specific reactant acted on by an enzyme.
Term
Denaturation
Definition
Loss of normal shape of a protein due to heat or other factor.
Term
Functional group
Definition
Group of atoms within a molecule that interacts in predictable ways with other molecules.
Term
Inorganic molecule
Definition
Non-carbon based molecule.
Term
Catalyst
Definition
Agent that speeds up chemical reactions.
Term
Amino acid
Definition
Monomer that makes up proteins;contains carboxyl and amino functional groups.
Term
Hydrocarbon
Definition
Organic molecule composed of only carbon and hydrogen atoms.
Term
Organic molecule
Definition
Carbon-based molecule.
Term
Protein
Definition
Polymer constructed from a set of 20 amino acid monomers.
Term
Carbohydrate
Definition
Organic compound made of sugar molecules.
Term
Hydrophilic
Definition
Attracts water molecules.
Hydro=water Philic=loving
Term
Polymer
Definition
Long chain of small molecular units (monomers).
Term
Hydrophobic
Definition
Avoids water molecules.
Hydro=water Phobic=avoiding
Term
Monomer
Definition
Small molecular unit that is the building block of a larger molecule.
Term
Unsaturated fat
Definition
Fat with less than the maximum number of hydrogen in one or more of its fatty acid chains.
Term
Steroid
Definition
Lipid molecule with four fused carbon rings.
Term
Fat
Definition
Organic compound consisting of three carbon backbone attached to three fatty acids.
Term
Lipid
Definition
One of a class of water avoiding compounds.
Term
Cholesterol
Definition
Steroid molecule present in the plasma membranes of animal cells.
Term
Saturated fat
Definition
Fat in which all three fatty acid chains contain the maximum possible number of hydrogen atoms.
Term
Glycogen
Definition
Polysaccharide in animal cells that consist of many glucose monomers.
Term
Polysaccharide
Definition
Long polymer chain made up of simple sugar monomers.
Term
Disaccharide
Definition
Sugar with two monosaccharides.
Term
Cellulose
Definition
Polysaccharide made of glucose monomers that reinsforce plant cell walls.
Term
Monosaccharide
Definition
Sugar containing one sugar unit.
Term
Starch
Definition
Polysaccharide in plant cells that consists entirely of glucose monomers.
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