1. Activation energy is:
a. Energy that is lost as heat.
b. difference in energy between reactants and products.
c. energy that must be added to get a reaction started, which is recovered as the reaction proceeds.
d. Free energy.
e. Equal to the entropy times the absolute temperature.
2. The transition state in any reaction mechanisms is:
a. State of lowest potential energy
b. State of highest stability
c. State of highest potential energy
d. Any point between the energy of the reactants and the point of highest potential energy in the course of the reaction
3. The role of an enzyme in an enzyme-catalyzed reaction is to:
a. ensure that the product is more stable than the substrate.
b. make the free-energy change for the reaction more favorable.
c. increase the rate at which substrate is converted into product.
d. ensure that all the substrate is converted to product.
e. do none of the above.
4. In the catalysis of a reaction, an enzyme
a. increases the Keq.
b. decreases the Keq.
c. increases the rate and decreases the activation energy of the reaction.
d. increases the rate and increases the activation energy of the reaction.
e. makes the (delta) G more negative for the reaction.
5. Enzymes are distinguished in their catalytic action from inorganic catalysts because enzymes:
a. lower the activation energy of the reaction catalyzed.
b. cannot influence the equilibrium point of the reaction.
c. are not consumed in the reaction.
d. have a strong specificity towards their substrates.
6. The specific site on the enzyme where __________ binds and catalysis occurs is called the _____________ site:
a. coenzyme; substrate
b. substrate; active
c. coenzyme; regulatory
d. regulatory; active
e. none of the above