Related Words

Enzyme: Helpful protein molecules, responsible for a multitude of chemical reactions within the body.

One Gene, One Enzyme Hypothesis: Holds that a single gene controls the production, specificity, and activity of each enzyme in a metabolic pathway. Thus, mutation of such a gene changes the ability of the cell to carry out . . . View Full Definition

Isoenzyme: An enzyme performing the same function as another enzyme but having a different set of amino acids. The two enzymes may function at different speeds.

Restriction Enzymes: A series of enzymes that attach to DNA molecules at specific nucleotide sequences and cut both strands of DNA at those sites. A bacterial enzyme that cuts DNA at a specific recognition seque . . . View Full Definition

Restriction Enzyme Cutting Site: A specific nucleotide sequence of dna at which a particular restriction enzyme cuts the dna. Some sites occur frequently in dna (e.g., every several hundred base pairs), others much less fre . . . View Full Definition

Coenzyme: A substance that works with an enzyme to promote the enzyme's activity.

Endonuclease Restriction Enzyme: A protein that recognizes specific, short nucleotide sequences and cuts dna at those sites. Bacteria contain over 400 such enzymes that recognize and cut more than 100 different dna sequences.

Coenzymes: Chemicals required by a number of enzymes for proper functioning; also known as enzyme cofactors.

Restriction-Enzyme Cutting Site: A specific nucleotide sequence of dna at which a particular restriction enzyme cuts the dna. Some sites occur frequently in dna (e.g., every several hundred base pairs): others much less fre . . . View Full Definition

Enzymes: Protein molecules that act as catalysts in biochemical reactions.