# Enzyme Reaction

## Enzyme Reaction

 Question 1
If the free energy change ($\delta$G) 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

 Question 2
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

 Question 3
Hydrogen and oxygen release enormous amounts of energy when they react. Yet, hydrogen and oxygen can be mixed together in a balloon and nothing will happen. Why?
 A Competitive inhibitors are blocking the reaction from occurring in the active site B There must be contaminating elements in the balloon that prohibit the reaction from occurring C The energy of activation to form the transition-state complex is too high to allow the reaction to occur without assistance D all of the above

 Question 4
The fact that $\beta$-oxidation of fatty acids, occurs in the mitochondria whereas fatty acid synthesis occurs in the cytoplasmic matrix, is an example of regulation of enzymatic activity by the ..... mechanism.
 A compartmentation B induction C competitive inhibition D repression

 Question 5
In the reaction, C$_{6}$H$_{12}$O$_{6}$ + 6O$_{2}$ $\rightarrow$ 6CO$_{2}$ + 6H$_{2}$O + energy, which component is being reduced?
 A O$_{2}$ B CO$_{2}$ C H$_{2}$O D Energy

 Question 6
Reduction is the
 A loss of proton B gain of electron C loss of electron D gain of protons

 Question 7
The ability of FADH to be oxidized is ..... than the ability of FAD to be oxidized.
 A greater B lesser C approximately equal D half

 Question 8
The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be ..... than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.
 A greater B lesser C approximately equal D half

 Question 9
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

 Question 10
An exergonic reaction is one that
 A requires energy to proceed B releases energy for work C gives off much heat D looses energy
There are 10 questions to complete.