BIOCHEMISTRY - Main Regulators and Biological Fluids of the Human Body - 2016

1. ENZYMES

1.8. Questions for Practical Class Preparation

1. Choose the number of the correct answer option.

Enzymes are characterized by the following property:

1) thermostable;

2) have a low molecular weight;

3) act with a 100% yield;

4) specific.

2. Choose the number of the correct answer option.

At the optimal Temperature:

1) The rate of the enzymatic reaction is minimal;

2) the rate of the enzymatic reaction is maximal;

3) enzyme Denaturation occurs;

4) enzyme activity is minimal;

5) Enzyme inactivation occurs.

3. Choose the number of the correct answer option.

By their chemical nature, enzymes in the body are:

1) Nucleic Acids;

2) Proteins;

3) Amino Acids;

4) higher alcohols;

5) Lipids.

4. Choose the number of the correct answer option.

The protein part of an enzyme is called:

1) a repressor;

2) a prosthetic group;

3) an apoenzyme;

4) a coenzyme;

5) an inhibitor.

5. Choose the correct answer option.

The non-protein moiety of an enzyme is called:

1) an activator;

2) an apoenzyme;

3) a coenzyme;

4) a holoenzyme;

5) an inhibitor.

6. Choose the correct answer option.

If the non-protein part of an enzyme is tightly bound to the protein part, it is called:

1) a coenzyme;

2) a prosthetic group;

3) a coenzyme;

4) an apoenzyme;

5) an activator.

7. Choose the correct answer option.

Enzymes that catalyze the joining of simple molecules into more complex ones coupled with ATP breakdown belong to the Class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) Hydrolases;

5) isomerases;

6) lyases.

8. Choose the correct answer option.

Enzymes that catalyze the Hydrolysis of complex compounds into simpler molecules belong to the class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) hydrolases;

5) isomerases;

6) lyases.

9. Choose the correct answer option.

Enzymes that catalyze oxidation-reduction reactions belong to the class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) hydrolases;

5) isomerases;

6) lyases.

10. Choose the correct answer option.

Enzymes that catalyze The transfer of chemical groups from one molecule to another belong to the class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) hydrolases;

5) isomerases;

6) lyases.

11. Choose the correct answer option.

Enzymes that catalyze the interconversion of isomers belong to the class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) hydrolases;

5) isomerases;

6) lyases.

12. Choose the correct answer option.

Enzymes that catalyze bond Cleavage reactions belong to the class of:

1) oxidoreductases;

2) transferases;

3) ligases;

4) hydrolases;

5) isomerases;

6) lyases.

13. Choose the correct answer option.

Starch gives a positive reaction (dark blue coloration):

1) upon heating with a Tyrosine solution;

2) upon interaction with an iodine solution;

3) upon heating with a copper(II) sulfate solution in an alkaline medium;

4) upon interaction with a lead(II) acetate solution.

14. Choose the correct answer option.

The Hydrolysis of Starch under the action of salivary amylase produces:

1) amino acids;

2) sucrose residues;

3) nucleic bases, ribose, and phosphoric acid;

4) dextrins, maltose, glucose.

15. Choose the correct answer option.

A positive Trommer's test is given by:

1) starch;

2) hydrolyzed starch;

3) sucrose.

16. Choose the correct answer option.

Starch hydrolysis products yield a negative reaction:

1) upon heating with a tyrosine solution;

2) upon interaction with an iodine solution;

3) upon heating with a copper(II) sulfate solution in an alkaline medium;

4) upon interaction with a lead(II) acetate solution.

17. Choose the correct answer option.

Activators of salivary amylase are:

1) chloride ions;

2) cyanides;

3) copper(II) ions;

4) Bile acids;

5) lead(II) ions.

18. Choose the correct answer option.

Inhibitors of salivary amylase are:

1) chloride ions;

2) cyanides;

3) copper (II) ions;

4) bile acids;

5) lead (II) ions.

19. Choose the correct answer option.

The enzyme catalase decomposes hydrogen peroxide to form:

1) oxygen and Water;

2) hydrogen and water;

3) oxygen and hydrogen.

20. Choose the correct answer option.

The enzyme tyrosinase is a metalloprotein and contains the following ions in its Structure:

1) iron (II);

2) lead (II);

3) calcium;

4) copper (II).