chap.3 Enzymes

1.       

Chapter no.3 Enzymes

 

2.       

The nature of biological catalyst is

(a) Protein                    (b) Lipid

(c) Carbohydrate          (d) Nucleic acid

A

3.       

The part of enzyme where reaction takes place

is called:

(a) Substrate                 (b) Coenzyme

(c) Active Site              (d) None of these

C

4.       

How many reactions are catalyzed by a

specific enzyme?

(a) Only one                (b) Two reactions

(c) Many reactions       (d) No reaction

A

5.       

Lock and key hypothesis was proposed by

Fischer in:

(a) 1790                       (b) 1890

(c) 1990                       (d) 1999

B

6.       

The amount of energy required to start a

reaction is called:

(a) Kinetic energy        (b) Potential energy

(c) Activation energy   (d) None of these

C

7.       

Co-enzymes are derived from:

(a) Vitamins                 (b) Minerals

(c) Both a and b                      (d) None of these

C

8.       

Cofactor may be:

(a) Organic                   (b) Inorganic

(c) Metalic lons            (d) All of these

D

9.       

Beriberi is caused due to the lack of:

(a) Vitamin A               (b) Vitamin B

(c) Vitamin C               (d) Vitamin K

B

10.   

Which one of the following is a co-enzyme?

(a) NAD                       (b) FAD

(C) NADP                    (d) All of these

D

11.   

Non-protein organic part of enzyme is

called:

a) Co-enzyme              (b) Holoenzyme

(c) Prosthetic group      (d) All of these

A

12.   

Apoenzyme is:

(a) Proteins                  (b) Carbohydrate

(c) Vitamin                  (d) Amino acid

A

13.   

a substance unrelated to the substance that reversible changes  the activity of an enzyme by binding at a site  other than active site is known as:

a) competitive inhibitor            (b) catalytic inhibitor

c) allosteric inhibitor    (d) catalytic inhibitor

C

14.   

Lock and key o theoy was suggested by

a)emilfisher                 (b) Koshland

(c) Anselme Payen       (d) Eduard Buchner

A

15.   

The optimum pH for urease is:

(a) 15-16                      (b) 2

(c)4.5                           (d) 7

D

16.   

All enzymes are proteins except:

(a) Ribozyme               (b) Lysozyme

(c) Both of these          (d) None of these

A

17.   

Lock and key model was rejected by:

(a) E. Fischer               (b) D. Koshland

(c) Fedrick                   (d) R. Mortin

B

18.   

The structure of enzyme must go a slightly change is the statement of:

(a) Key- Lock Model

(b) Hand-Gloves Model

(c) Induced --Fit Model

(d) Both b and c

D

19.   

(2H O 2H,O+ O:) For the given reaction

activation energy is 86 kJ/mol with no catalyst.What will be the Ex required if same reaction is performed in presence of enzyme?

(c) 86 kJ/mol               (b) 8.6kJ/mol

(c) None of these         (d) Ikg/mol

D

20.   

Vitamin B acts as co-enzymes. What will happen if Vitamin B is reduced / missing in a body?

(a) No-effect

(b) Metabolism is effected

(c) Beri-beri is produced

(d) Both b and c

C

21.   

Peptidase and esterase both belong to:

(a) Hydrolase               (b) Isomerase

(c) Transferase                         (d) Both a and b

A

22.   

The optimum temperature for snow flea is:

(a) 37°C                       (b) 0°C

(c) 10°C                       d. -100C

D

23.   

What will happen to enzyme activity, if temperature becomes 0°C:

(a) Activity will be zero

(b) Minimum

(c) No effect               

(d) Enzyme will be denatured

B

24.   

What is physiological pH for most of enzymes:

(a) 7-8                          (b) 1 - 3

(C) 5-7                         (d) 1 - 14

A

25.   

Which of the following acts as non- competitive inhibitors:

(a) Cyanides                (b) Heavy-metal ions

c)Insecticides               (d) All of these

D

26.   

The non-competitive inhibitors binds with:

(a) Active of enzyme   (b) Receptor site

(c) Allosteric site          (d) Both b and e

D

27.   

The optimum pH value for pepsin to work in is:

(a) 6.8                          (b) 5.5

(c) 4.5                          (d) 2

D

28.   

The enzyme of the arctic snow flea works at:

(a) 60°C                       (b) 30°C

(c) 40°C                       (d)-10°C

D

29.   

Which of the following factors does not affect the rate of enzyme action:

(a) Enzyme concentration

(b) Light intensity

(c) Substrate concentration

(d) Temperature

B

30.   

The suffix which is added to substance to name of an enzyme:

(a) lce                          (b) Ace

(c) Ise                          (d) Ase

D

31.   

The enzyme decarboxylase, deaminases and

synthases are examples of:

(a) Hydrolase               (b) Lyases

(c) Ligases                   (d) Isomerases

b

32.   

All enzymes are protein except:

(a) Ribozyme               (b) Lysozyme

(c) Both of these          (d) None of these

A

33.   

The structure of enzyme must go a slightly change is the statement of:

(a) Key-lock Model     (b) Hand-gloves Model

(c) Induced -fit Model (d) Both b and c

C

34.   

Peptidase and esterase both belong to:

(a) Hydrolase               (b) Isomerase

(c) Transferase                         (d) Both a and b

A

35.   

 At very high temperature enzyme loses its catalytic activity due to:

(a) Loss of active site

(b) Denaturation

(c) Prosthetic

(d) Saturation with substrate.

B

36.   

Study about enzyme is called:

(a) Mycology               (b) Phycology

(c) Enzymology                       (d) Ornithology

C

37.   

The example of oxidoreductase are:

(a) Oxidase                  (b) Peroxidase

(c) Oxygenase              (d) All of these

D

38.   

________catalyze bond formation between two substrate molecules.

(a) Isomerase               (b) Hydrolase

(c) Ligase                     (d) Lyases

C

39.   

What is the pH of urease and catalase?

(a) 8                             (b) 6.1-6.8

(c) 7                             (d) 4-5

C

40.   

The example of competitive inhibitor is:

 (a) Cyanide                 (b) Heavy Metals

(c) Insecticides                         (d) Sulphonamide

D

41.   

Co-enzymes are attached to enzymes by bond.

(a) Covalent bond

(b) Ionic bond

(c) Coordinate covalent bond

(d) Weak bond

D

42.   

What are the characteristics of enzymes?

(a) Protein in nature except ribozymes (Ribosome)

(b) Do not alter the equilibrium of a reaction

(c) Globular in nature and lower the activation energy

(d) All  of these

D

43.   

As the enzyme concentration increases the rate of the reaction linearly.

(a) Decreases               (b) Increases

(c) Does not affect rate            (d) None of these

B

44.   

Sometimes enzymes and substrate are held together by the kind of bonds called:

(a) Ionic                       (b) Hydrogen

(c) Hydrophobic          (d) Covalent.

D

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