MCAT enzymes questions n answers

MCAT enzymesEnzyme - correct answer Biological catalyst Lower activation energy Increase rate of reaction Are not changed or consumed during reaction pH and temperature sensitive Do not affect overall Delta G Specific for a particular reaction or class of reactions Do not change equilibrium of a reaction Urease - correct answer Catalyzes the breakdown of urea Oxidoreductases - correct answer Catalyze oxidation-reduction reactions, transfer of electrons between biological molecules. Often require cofactors that acts as electron carrier, NAD+ or NADP+. The electron donor is the reductant Electron acceptor is oxidant Enzymes with dehydrogenase or reductant in their name are usually oxidoreductases Transferases - correct answer Catalyze the movement of a functional group from one molecule to another. Includes kinases Kinases - correct answer Transferase enzymes that catalyze the transfer of a phosphate group, generally ATP, to another molecule Hydrolases - correct answer Catalyze breaking of a compound into two molecules using the addition of water. Usually named only for substrate. Includes phosphatases, peptidases, nucleases, lipases