Reactants capable of interacting to form products in a chemical reaction must fi
ID: 100837 • Letter: R
Question
Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as the reaction's A) entropy. B) activation energy. C) endothermic level. D) equilibrium point. E) free-energy content. The active site of an enzyme is the region that A) binds allosteric regulators of the enzyme. B) is involved in the catalytic reaction of the enzyme. C) binds noncompetitive inhibitors of the enzyme. D) is inhibited by the presence of a coenzyme or a cofactor. Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? A) denaturization of the enzyme B) allosteric inhibition C) competitive inhibition D) saturation of the enzyme activity E) insufficient cofactors Which of the following is true of enzymes? A) Nonprotein cofactors alter the substrate specificity of enzymes. B) Enzyme function is increased if the 3-D structure or conformation of an enzyme is altered. C) Enzyme function is independeExplanation / Answer
Answer:
(1) (B) Activation energy
Explanation:
Activation energy is energy required to cause a chemical reaction, specifically the energy required to reach the transition state.
(2) (B) is involved in the catalytic reaction of the enzyme.
Explanation:
Active site is location on an enzyme where substrates bind and react.
(3) (C) competitive inhibition
Explanation:
Competitive inhibition is a form of enzyme inhibition where the inhibitor binds to the active site on the enzyme and prevents binding of the substrate. It can be reversed by increasing the concentration of the substrate.
(4) (D) Enzymes increase the rate of chemical reaction by lowering activation energy barriers.
(5) (B) by changing the shape of the enzyme's active site
Explanation:
Noncompetetive inhibition involves the binding of an inhibitor to a site in an enzyme away from its active site. It acts by changing the conformation of the active site such that the substrate cannot bind.
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