BIOLOGY

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COFACTORS.-- is a non-protein chemical compound that is bound to a protein and is required for the protein´s biological activity. Cofactors can be divided into two broad groups: organic cofactors, such as flavin or heme, and inorganic cofactors: such as the metal ions Mg2+, Cu+, Mn2+ or iron-sulfur clusters.

ENZYMES.-- are biomolecules that catalyze chemical reactions. cofactors are examples of enzymes. RIBOZYMES.-- is an RNA molecule that catalyzes a chemical reaction. VITAMINS.-- is an organic compound required as a nutrient in tiny amounts by an organism.

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cell membrane and osmosis media type="custom" key="3511170" phospholipids: are a class of lipids that are the major component of a cell membrane. shrink: to contract, to become smaller. hypertonic: having an osmotic presure in a fluid relative to another fluid. osmotic presure : a hydrostatic pressure caused by a difference in the amounts of solutes between solutions.

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__swine influenza__
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