6. If the Keq for an enzymatic reaction is greater than 1, the reaction

A. will be endergonic
B. can not occur without the input of energy
C. both (a) and (b)
D. none of these

7. An exergonic reaction is one that

A. requires energy to proceed
B. releases energy for work
C. gives off much heat
D. loses energy

8. If the free energy change (ΔG) in a reaction is a negative value, it indicates that the

A. reaction releases energy
B. reaction absorbs energy
C. reaction is in negative direction
D. reaction is in positive direction

9. To a living organism, which of the following has the greatest amount of available energy per molecule?

A. ATP
B. ADP
C. AMP
D. H₂O

10. Which of the following is the best evidence for the lock and key theory of enzyme action?

A. Compounds similar in structure to the substrate inhibit enzyme activity
B. Enzymes are found in living organisms and speed up certain reactions
C. Enzymes speed up reactions by definite amounts
D. Enzymes determine the direction of a reaction