Biochemistry Quiz on Enzymology (Enzymes)

This quiz is designed to assess your understanding about the "Enzymology Basics". Choose the best answer from the four options given. When you've finished answering as many of the questions as you can, scroll down to the bottom of the page and check your answers by clicking 'Score'. Percentage score will be displayed along with right answers.

1. The enzyme:
increases total energy of activation
increase total energy of the product
decrease the energy of activation
increase the equilibrium constant
2. Co enzymes are:
colloidal protein molecules
different forms of the same enzyme
dialyzable, non ptotrien molecule
structural analongs of an ennyme
3. In enzyme kinetics, Vmax denotes
half the substrate concentration
substrate concnetration
the amount of an active enzyme
quantity of enzyme substrate complex
4. The KM value of an enzyme is:
the total enzyme concentration
The substrate concentration at half maximal velocity
half the substrate concentration at maximal velocity
Dissociation constant of enzyme substrate complex
5. When substrate concentration is equal to Km value:
The reaction is now at equibrillium
Maximum velocity is achieved.
maximum enzyme moleules are taking part in the reaction
Half of the enzyme molecules are bound to the substrate molecules and the other half are free
6. In competitive inhibition:
Km is increased and Vmax is increased
Km is increased and Vmax is normal
Km is decreased and Vmax is normal
Km is decreased and Vmax is increased
7. Allosteric enzymes show all the following characteristics, except:
sigmoid kinetics
binding between substrate and regulatory sites
cooperative binding of the substrate
substrate binding site and regulatory site are different
8. Enzymes synthesized in inactive form are called:
Apoenzymes
coenzymes
proenzymes
none of these
9. A competitive inhibitor will affect the enzyme activity:
Decreasing Km value
increasing Vmax
precipitating the enzyme protein
irreversibly denaturing the enzymes
10. Digestive enzymes belong to the class:
Lysases
Ligases
Hydrolases
oxidoreductases
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