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BCCB2000 Lecture 8 Questions Exam Study Guide
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BCCB2000 Lecture 8 QuestionsExam Study Guide
Enzymes act as catalysts because:
A. they are specific for only one substrate
B. they bind the transition state of the reaction catalysed
C. their active sites are complementary to the substrate of the reaction
D. they are not altered by the reaction catalysed
E. they do not change the position of a thermodynamic quilibrium - Answer B. they bind
the transition state of the reaction catalysed
When no other non-protein factor is needed for an enzyme to work then the enzyme is
known as:
A. A Holoenzyme
B. An Apoenzyme
C. Conjugated
D. Unconjugated - Answer D. Unconjugated
Allosteric enzymes:
A. depend mainly upon covalent modification of the enzyme
B. bind ligands reversibly
C. have a Km that is 1/3 Vmax
D. usually show strict Michaelis-Menten kinetics.
E. have a Vmax that depends only on substrate concentration - Answer B. bind ligands
reversibly
Consider the following information:
Acid-base catalysis is the general term given to an enzyme-catalysed reaction that uses
ionized groups in the enzyme active site to act as proton donors or acceptors. The
ionizable groups that participate in this reaction must be in the correct protonation state
for catalysis to occur.
, Some pKa's for amino acid side chains are as follows:
E = 4.3
D = 3.9
C = 8.3
Y = 10.1
K = 10.8
R = 12.5
H = 6.0
An enzymatic reaction works best at pH 6 to 8. This is compatible with the assumption
that the reaction mechanism requires two ionizable amino acid side chains in the active
site of the enzyme possibly:
A. protonated glutamate and deprotonated aspartate
B. protonated histidine and deprotonated lysine
C. protonated glutamate and deprotonated histidine
D. protonated arginine and deprotonated lysine
E. protonated cysteine and deprotonated histidine - Answer E. protonated cysteine and
deprotonated histidine
Which of the following potentially provide an answer to the question 'Why are enzymes
so big?' when compared with small non-enzyme catalysts?
A. The large size of the enzyme may protect it the active site from damage.
B. The large size of the enzyme is needed to increase the activation energy of a reaction
C. The large size of the enzyme may be involved in its regulation
D. The large size of the enzyme forms a scaffold to optimally interact with the substrate.
- Answer A. The large size of the enzyme may protect it the active site from damage.
C. The large size of the enzyme may be involved in its regulation
D. The large size of the enzyme forms a scaffold to optimally interact with the substrate.
Catalase is an enzyme that catalyses the following reaction:
2H2O2 ---> 2H2O + O2
Choose the most likely and appropriate answer from the following list of statements.
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