Enzymes Biology Test 02

Total Questions: 23

1 - The concept of metabolism was first of all given by;

A ) Jabir bin Hayyan
B ) Ibn-e-Nafees ✅
C ) Bu Ali Sina
D ) Aristotle

2 - All of the following are vitamins EXCEPT:

A ) Riboflavin
B ) Thiamine
C ) Folic Acid
D ) Heme ✅

3 - It helps in the transport of chemical groups from one enzyme to another?

A ) Cofactors
B ) Coenzymes ✅
C ) Enzymes
D ) Prosthetic group

4 - Enzyme activity can also be regulated by;

A ) Inhibitors
B ) Activators
C ) Inhibitors and activators ✅
D ) Temperature above 37°C

5 - Cofactors are;

A ) Protein molecules
B ) Lipid molecules
C ) Non-protein molecules ✅
D ) Starch molecules

6 - Enzymes are used in;

A ) Food industry
B ) Brewing industry
C ) Paper industry
D ) All of the above

7 - More acceptable model for enzymes is:

A ) Induced Fit model ✅
B ) Lock and key model
C ) Induced Fit model and Lock and Key model
D ) Enzyme substrate model

8 - The example of co-enzyme is;

A ) Pyruvic acid
B ) Thiamine
C ) Folic acid
D ) Folic acid and thiamine ✅

9 - Enzymes may be;

A ) Intracellular
B ) Extracellular
C ) Non -protein
D ) Intracellular and extra-celluar ✅

10 - According to which model, active site is not a rigid structure rather it is moulded into the required shape to perform its function?

A ) Fluid Mosaic model
B ) Lock and key model
C ) Induced Fit model ✅
D ) Enzyme substrate model

11 - Lipase enzyme acts only on lipids and digests them into;

A ) Fatty acids and glycerol ✅
B ) Glycerol
C ) Fatty acids
D ) Amino acids

12 - Both enzyme and substrate possess specific shapes that fit exactly into one another according to:

A ) Induced Fit model
B ) Lock and key model ✅
C ) Fluid Mosaic model
D ) Enzyme substrate model

13 - When ES complex breaks, it releases:

A ) Enzyme
B ) Product
C ) Substrate
D ) Enzyme and product ✅

14 - Enzyme attaches with substrate to form:

A ) Product
B ) Reactant
C ) ES complex ✅
D ) Active site

15 - All enzymes work at their maximum rate at the narrow range of pH, card;

A ) Optimum temperature
B ) Optimum pH ✅
C ) Denaturation of enzyme
D ) Saturation of active sites

16 - When the active sites of all enzymes are occupied, any more substrate molecules do not find free active sites. This state is called;

A ) Denaturation of enzyme
B ) Saturation of active sites ✅
C ) Optimum pH
D ) Optimum temperature

17 - Example of globular proteins is:

A ) Hormones
B ) Enzymes ✅
C ) Cofactors
D ) Prosthetic group

18 - All biochemical catalysts are:

A ) Lipids
B ) Proteins
C ) Carbohydrates
D ) None of these

19 - Enzymes are usually very specific for the;

A ) Type of reaction
B ) For the nature of their substrate
C ) For the type of reaction and for the nature of their substrate ✅
D ) Rate of reaction

20 - Only a small protein of enzyme molecule is directly involved in catalysis. This catalytic region is known as;

A ) Inactive site
B ) Active site ✅
C ) Non-reactive site
D ) Active and inactive site

21 - Nature of flavin as a cofactor is:

A ) Inorganic
B ) Metal ions
C ) Organic ✅
D ) Metalloids

22 - Nature of metal ion as a cofactor is:

A ) Inorganic ✅
B ) Organic
C ) Organic and inorganic
D ) Metalloids

23 - Pepsin is active in?

A ) Acid ✅
B ) Base
C ) Alkali
D ) Netural medium