Enzymes – Online MCQs Test – Biology MCAT

1. Substances which decrease the activity of enzyme are called:

Inhibitors

Activators

Apo-enzymes

Co-enzymes

2. Co-factors include:

Phospholipids

Flavin mononucleotide

Magnesium

Acylglycerol

3. Which of the following lacks enzymes?

Prokaryotes

Algae

Fungi

Viruses

4. Non-competitive inhibitor is one which:

Normally binds to active site of an enzyme

Binds away from the active site of an enzyme

Competes to the active site of enzyme

Binds close the active site of an enzyme

5. The conversion of complex food into simpler and soluble substances by the action of enzymes is

Digestion

Translocation

Ingestion

Assimilation

6. Molecule of ribonucleic acid which function as enzymes are called:

Ribozames

Ribozomes

Ribosomes

Ribozymes

7. If the non-protein part is covalently bonded to an enzyme. it is knows as

Activator

Apo-enzyme

Prosthetic group

Coenzyme

8. Concerning temperature affecting enzyme activity, which of the following statement is correct?

Enzymes are temperature-resistant

Most enzymes are highly active at 37°C

Most enzymes are highly active at 50°C

Enzymes are completely destroyed at 50°C

9. In non-competitive inhibition, the binding site other than the active site is called:

Prosteric site

Allo-enzyme site

Allosteric site

Prosthetic site

10. Molecule binds to the active site of an enzyme is:

Competitive Inhibitor

Allosteric Activator

Non-competitive Inhibitor

Allosteric Inhibitor

11. Enzyme is a Greek word which means:

in virus

in yeast

in bacteria

in fungi

12. Coenzyme can function

In association with a protein

Independently of the Apo-enzyme

In association with an Apo-enzyme

In association with a vitamin

13. temperature of enzymes present in human body is __________Optimal

33°C

27°C

37°C

47°C

14. In plants enzymes are present

Only in flowers

In all the living cells of paint body

Only in leaves

Only in parenchyma

15. The inorganic ions which act as a prosthetic group in holoenzymes are called:

Co-factors

Ho a-group

Co-enzymes

Co-activators

16. Any factor that can alter the chemistry an shape of an enzyme can affect us rate of.

Hydrolysis

Activity

Photolysis

Catalysis

17. Enzymes are useful to plants because.

They are essential for the metabolic processes

They are used up in reactions.

They are building blocks of chlorophyll.

They enhance absorption of water and salts.

18. Which statements are correct for all enzymes?

1, 2, 3 and 4

1, 2 and 3 only

2 and 4 only

1 and 4 only

19. The charge and shape of the active site is formed by:

Allosteric site

Cofactor

Globular shape

Amino acids

20. Non-protein part of an enzyme is Known as

All of the above

Coenzyme

Holoenzyme

Apoenzyme

Enzymes-Medical College Admission Test Preparation Notes