Enzyme Reaction

 

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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.

 

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