Biology Chapter 7 Entry test MCQs
Topic 7
Introduction and Characteristics of Enzymes
1. If enzymes stop their functions, then biochemical reactions would:
a. Not affected
b. Stop
c. Carried out at faster rate
d. Be slowed down
2. All of the following are true for an enzyme except:
a. Remain unchanged after reaction
b. is globular protein
c. Speed up the reaction
d. Increase the energy of activation
3. Enzymes catalyze all of the followings except:
a. Photosynthesis
b. Digestion
c. Breathing
d. Cellular respiration
4. The lower the activation energy, the———–the reaction will be.
a. Faster
b. Moderate
c. Slower
d. Both A and B
5. Most of the enzymes are:
a. Free floating
b. Attached with organelles
c. In coagulated form
d. In cytoplasm
6. Enzymes related to fatty acids oxidation are present in/at:
a. Mitochondria
b. Plasma membrane
c. Nucleolus
d. Chloroplast
7. All enzymes are————-
a. Low molecular weight proteins
b. Fibrous proteins
c. Globular proteins
d. Lipoproteins
8. The reactants on which enzyme work are:
a. Metabolites
b. Products
c. Catabolites
d. Substrates
9. What is true about enzymes?
a. Use in reaction
b. Fibrous proteins
c. Non-specific
d. No effect on end product
10. The main difference between catalysts and enzymes is:
a. Catalysts are imorganic while enzymes are organic in nature
b. Enzymes are sharp in action than catalyst
c. Enzymes need p11 while catalysts do not
d. Catalysts used in large amount than enzymes
11. The type of energy reduced by the enzymes for biological reactions to occur is called the:
a. Activation Energy
b. Light Energy
c. Heat Energy
d. Active Energy
12. Enzymes work by lowering the———of the reactions they catalyze.
a. Activation energy
b. Kinetic energy
c. Potential energy
d. Heat energy
13. It is false about enzymes:
a. They work in vitro as well as in vivo conditions
b. All enzymes require co-factors for proper functioning
c. They lower activation energy
d. Only small amount of enzymes is required
Mechanism of Enzyme Action
14. The reaction takes place in a small part of the enzyme called:
a. Reactive site
b. Allosteric site
c. Active site
d. Globular site
15. Coenzymes are closely related to:
a. Inhibitors
b. Hormones
c. Vitamins
d. Antibodies
Enzyme
16. The atoms, groups of atoms and molecules that join with enzymes altering their shape and making them functional:
a. Coenzymes
b. Substrate
c. Co-factors
d. Prosthetic Group
17. If the co-factor is a non-protein like a metallic ion, it is referred to as a:
a. Activator
b. Apoenzyme
c. Prosthetic group
d. Coenzymes
18. Non-protein part which is organic in nature and detachable is called:
a. Co-factor
b. Activator
c. Prosthetic group
d. Coenzyme
19. Function of succinate dehydrogenase is aided by:
a. FAD+
b. NAD+
c. Vitamin
d. Metal ion
20. Prosthetic groups are:
a. Organic molecules
b. Metallic ions
c. Radicals
d. Inorganic molecules
21. All coenzymes are derived from:
a. Carbohydrates
b. Proteins
c. Vitamins
d. Metal ions
22. A co-factor tightly bound to the enzyme on the permanent basis is called:
a. Coenzyme
b. Activator
c. Apo-enzyme
d. Prosthetic group
23. An enzyme required Mg+2 to catalyze the substrate. The Mg+2 is best identified as:
a. Activator
b. Prosthetic group
c. Inhibitor
d. Coenzyme
24. Which of the following comprises of inorganic lons?
a. Activators
b. Coenzymes
c. Apoenzyme
d. Prosthetic group
25. A non-protein part essential for proper and essential functioning of enzyme is called:
a. Additional factor
b. Extra factor
c. Co-factor
d. Efficient co-factor