ENZYMES
1. Oxidoreductases include:
a) Catalases and Mutases
b) Oxygenases and Dehydrogenases
c) Dehydrogenases and Ligases
d) Aminotransferases and Racemases
e) Epimerases and Oxidases
2. Michaelis constant of enzyme (Km) is:
a) The substrate concentration which gives
maximal velocity
b) The substrate concentration which gives 1/2
the maximal velocity
c) 1/2 the substrate concentration which gives
maximal velocity
d) The enzyme concentration which gives
maximal velocity
e) The enzyme concentration which gives 1/2 the
maximal velocity
3. A competitive inhibitor:
a) Increases the Km of the enzyme
b) Decreases the Vmax of the enzyme
c) Increases the Vmax of the enzyme
d) Decreases the Km of the enzyme
e) Increases both Km and Vmax of the enzyme
4. The non-protein part of an enzyme is called:
a) Apoenzyme
b) Holoenzyme
c) Allosteric Enzyme
d) Isoenzyme
e) Coenzyme
, 5. The major 6 classes of enzymes include:
a) Transferases and Oxygenases
b) Isomerases and Lyases
c) Hydrolases and Epimerases
d) Oxidoreductases and Catalases
e) Transaminases and Transferases
6. Enzymes:
a) Increase the energy barrier for a reaction
b) Are recovered chemically altered after a
complete reaction
c) Increase the equilibrium constant of the
reaction
d) Activity is subject to regulation
e) Are exclusively proteins
7. Coenzymes
a) The non-protein part of enzymes
b) Needed for enzyme activity
c) Usually vitamin derivatives
d) Termed prosthetic group if bonded tight to
their enzymes
e) All of the above are correct
8. At Vmax of an enzyme catalyzed reaction:
a) Further increase in substrate concentration
increases the rate of the reaction
b) All the enzyme molecules are combined with
substrate
c) The substrate concentration that produces
maximal velocity is termed Km
d) Half the enzymes are combined with substrate
e) Km is maximum
1. Oxidoreductases include:
a) Catalases and Mutases
b) Oxygenases and Dehydrogenases
c) Dehydrogenases and Ligases
d) Aminotransferases and Racemases
e) Epimerases and Oxidases
2. Michaelis constant of enzyme (Km) is:
a) The substrate concentration which gives
maximal velocity
b) The substrate concentration which gives 1/2
the maximal velocity
c) 1/2 the substrate concentration which gives
maximal velocity
d) The enzyme concentration which gives
maximal velocity
e) The enzyme concentration which gives 1/2 the
maximal velocity
3. A competitive inhibitor:
a) Increases the Km of the enzyme
b) Decreases the Vmax of the enzyme
c) Increases the Vmax of the enzyme
d) Decreases the Km of the enzyme
e) Increases both Km and Vmax of the enzyme
4. The non-protein part of an enzyme is called:
a) Apoenzyme
b) Holoenzyme
c) Allosteric Enzyme
d) Isoenzyme
e) Coenzyme
, 5. The major 6 classes of enzymes include:
a) Transferases and Oxygenases
b) Isomerases and Lyases
c) Hydrolases and Epimerases
d) Oxidoreductases and Catalases
e) Transaminases and Transferases
6. Enzymes:
a) Increase the energy barrier for a reaction
b) Are recovered chemically altered after a
complete reaction
c) Increase the equilibrium constant of the
reaction
d) Activity is subject to regulation
e) Are exclusively proteins
7. Coenzymes
a) The non-protein part of enzymes
b) Needed for enzyme activity
c) Usually vitamin derivatives
d) Termed prosthetic group if bonded tight to
their enzymes
e) All of the above are correct
8. At Vmax of an enzyme catalyzed reaction:
a) Further increase in substrate concentration
increases the rate of the reaction
b) All the enzyme molecules are combined with
substrate
c) The substrate concentration that produces
maximal velocity is termed Km
d) Half the enzymes are combined with substrate
e) Km is maximum
