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WorksheetsGB1-LT3
Total questions: 20
Worksheet time: 20mins
Enzymes ___.
A. are proteins, except for a few RNAs
B. lower the activation energy of a reaction
C. are changed by the reaction they catalyze
D. Both A and B
Enzymes function as ___.
A. energy carriers
B. biological catalysts
C. gas transporters
D. structural components
The specificity of an enzyme is due to ___.
A. its high molecular weight
B. the shape of its active site
C. its sensitivity towards pH change
D. the number of substrate molecules
Enzymes can be denatured by ___.
A. increasing the pH
B. changing the substrate
C. decreasing the temperature
D. extreme pH or temperature conditions
The specific region of an enzyme that binds to its substrate is called the ___.
A. activation energy
B. active site
C. product
D. substrate
Enzymes are often named by adding "-ase" to the end of the name of the substrate they act on. What enzyme would act on carbohydrates?
A. Glycosidase
B. Lipase
C. Nuclease
D. Protease
Enzymes catalyze reactions by lowering the activation energy of a reaction. What is activation energy?
A. The energy produced by catalysts.
B. The total energy of a chemical reaction.
C. The energy released during a chemical reaction.
D. The energy required to start a chemical reaction.
To which class of enzymes do dehydrogenases, oxidases, and reductases belong?
A. Ligases
B. Lyases
C. Oxidoreductases
D. Transferases
Enzymes that break down complex carbohydrates into simpler sugars belong to which class?
A. Hydrolases
B. Isomerases
C. Ligases
D. Lyases
Enzymes that catalyze the transfer of functional groups between molecules are known as ___.
A. Hydrolases
B. Isomerases
C. Oxidoreductases
D. Transferases
Enzymes that catalyze the conversion of one isomer into another are known as ___.
A. Isomerase
B. Ligases
C. Lyases
D. Oxidoreductases
Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.
succinate + FAD → fumarate + FADH2
Which substance was oxidized in the reaction?
A. FAD
B. FADH2
C. fumarate
D. succinate
Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.
succinate + FAD → fumarate + FADH2
Which substance was reduced in the reaction?
A. FAD
B. FADH2
C. fumarate
D. succinate
Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.
succinate + FAD → fumarate + FADH2
Which substance is the oxidizing agent?
A. FAD
B. FADH2
C. fumarate
D. succinate
Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.
succinate + FAD → fumarate + FADH2
Which substance is the reducing agent?
A. FAD
B. FADH2
C. fumarate
D. succinate
What is the difference between the lock and key mechanism and the induced fit mechanism?
A. The configuration of the active site
B. The composition of the enzyme
C. The type of substrate
D. The type of products formed
In the Lock and Key Mechanism, the active site is ___.
A. complementary to the active site
B. flexible
C. not complementary to the active site
D. rigid
In the Lock and Key Mechanism, the shape of the substrate is ___.
A. complementary to the active site
B. flexible
C. not complementary to the active site
D. rigid
In the Induced Fit Mechanism, the active site is ___.
A. complementary to the active site
B. flexible
C. not complementary to the active site
D. rigid
In the Induced Fit Mechanism, the shape of the substrate is ___.
A. complementary to the active site
B. flexible
C. not complementary to the active site
D. rigid
