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Enzymes Correct Answers!!
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Enzymes Correct Answers!!
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Enzymes Correct Answers!!which of the following statements about enzymes or their function is not true?
a. enzymes do not alter the overall ΔG for a reaction
b. enzymes are proteins whose 3-dimensional form is key to their function
c. enzymes change the Keq for the chemical reaction
d. enzymes speed up reactions by lowering activation energy Answer: c. enzymes change the Keq
for the chemical reaction
which statement about enzyme-catalyzed reactions is false?
a. enzymes form complexes with their substrates
b. many enzymes change shapes slightly when the substrate binds
c. enzymes increase the activation energy for chemical reactions
d. reactions occur at a specific site of enzymes Answer: c. enzymes increase the activation energy
for chemical reactions
the relationship between an enzyme and a reactant can be best described as:
a. an association stabilized by a covalent bond
b. a temporary association
c. one in which the enzyme is changed permanently
d. non-complementary binding Answer: b. a temporary association
in an enzyme velocity vs. [substrate] graph, why does velocity plateau?
a. substrate is depleted
b. the enzyme stops working
c. the enzyme is no longer specific for the substrate
, d. all the enzyme molecules are bound to the substrate molecules Answer: d. all the enzyme
molecules are bound to the substrate molecules
when [S] = KM, the velocity of an enzymatically catalyzed reaction is:
a. 0.1*Vmax
b. 0.2*Vmax
c. 0.5*Vmax
d. 0.9*Vmax Answer: c. 0.5*Vmax
given an enzyme reaction where a plot of 1/v vs. 1/[S] gives a straight line. it was found in 3 additional
experiments each using a different inhibitor concentration where the lines were parallel. this is an
example of:
a. competitive inhibition
b. uncompetitive inhibition
c. mixed inhibition
d. a ping-pong bibi reaction Answer: b. uncompetitive inhibition
the KM can be considered to be the same as the dissociation constant KS for E + S binding if:
a. this statement cannot be completed because KM can never approximate KS
b. ES -> E + P is fast compared to ES -> E + S
c. the turnover number is very large
d. k2 << k-1
e. kcat/KM is near the diffusion-controlled limit Answer: d. k2 << k-1
enzymes are *catalysts.* what does this mean? Answer: catalysts are agents that increase reaction
rate but are not consumed.
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