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MCAT

Enzymes

QuestionAnswer
Co-factor is a non-organic molecule whose presence is necessary for the proper function of an enzyme (eg Mg with DNA polymerase)
induced-fit the substrate and the enzyme each slightly modify their shape so that they can bind more tightly
OTHILL (6 types of enzymes:) oxidoreductase; transferase; hydrolase; isomerase; ligase; lyase
Positive Cooperative Binding substrate binding inc the affinity for more substrate binding (eg. hemoglobin for oxygen binding)
catalysts lower the activation energy but do not alter the position or direction of rxn equilibrium.
competitive inhibitor will dec rxn rate when the substrate concentration is low
noncompetitive inhibitor form of allosteric regulation where even if susbstrate concentration is high, the binding of this type of inhibitor will slow rxn rate
allosteric regulation regulatory molecule (an activator or inhibitor) binds to an enzyme/protein someplace other than the active site. (eg. CO2 binding to Hb to cause Hb to inhibit binding to O2)
co-enzyme is an organic carrier molecule (eg. NADH carries electrons; CoA carries acetyl groups)
 



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