Enzymes MCQs with Answers

Enzymes MCQs

Hello students, our today’s topic is ‘Enzymes’. Lots of reactions occur in the human body and it’s very interesting that someone controls these reactions. In 1833, a French chemist Anselme payen was the very first to discover and named ‘Enzyme’. Enzymes are substances or proteins or RNA.

The following MCQs will help you to know more about ‘Enzymes’.

MCQ.1): …………………………………………………………………. do speed up the rate of the biochemical reaction and are biological catalysts.

a) Enzymes

b) Deoxyribonucleic acid

c) Mitochondria

d) None of them

MCQ.2): In some cases RNA also acts as enzymes and it is called as …………………………………………………………….

a) A DNA

b) Ribozymes

c) Rhizom

d) tRNA

MCQ. 3): The ………………………………………………………………. Is the region where substrate, cofactors and prosthetic groups binds and contains residue that helps to hold the substrate.

a) Active site

b) Specific site

c) Amino acid residue

d) All of them

MCQ.4): How many types of active sites are there in enzymes?

a) One

b) Two

c) Three

d) Four

MCQ.5): Which is the non-protein molecule that carries out chemical reactions and unable to perform by 20 amino acids?

a) Enzymes

b) Proteins

c) Co-factors

d) RNA

MCQ.6): Which of the following is a tightly arranged organic cofactor?

a) Coenzymes

b) Prosthetic group

c) Inorganic factor

d) NAD+

MCQ.7): Which is a designated as an enzyme with its cofactor removed?

a) Apoenzyme

b) Riboenzyme

c) Holoenxyme

d) Akoenzyme

MCQ.8): In the cell, intracellular enzymes are synthesized and utilized in the cell for use of …………………………………………………………………….

a) Brain

b) Cell itself

c) Hepatic cell

d) Liver

MCQ.9): In the extracellular enzyme, digestive enzymes were produced by the pancreas but are not used by the ………………………………………………………….

a) Cell of liver

b) Cells of pancreas

c) Cells of duodenum

d) Cells of stomach

MCQ.10): Enzymes are sensitive to change ………………………………………………………………….

a) pH

b) Temperature

c) Substrate concentration

d) All of them

MCQ.11): A classification of enzymes which is systematic has been developed by …………………………………………………………………….

a) Internal Enzyme Center

b) International Enzyme Commission

c) Inter Enzyme Coordinator

d) International Enzyme Company

 

Answer

1) a) Enzymes

2) b) Ribozymes

3) a) Active site

4) b) Two

5) c) Co-factors

6) b) Prosthetic group

7) a) Apoenzyme

8) b) Cell itself

9) b) Cells of pancreas

10) d) All of them

11) b) International Enzyme Commission

More MCQ:

1) Identify the intracellular enzymes

a ) ATPase  b) cytochrome C reductase

c) pepsin d) both a and b

Ans. Both a and b

2) Metabolic reactions are

( I ) Constructive reactions (II) Destructive reactions (III) Inhibiting reactions

(a) I only b) I and II only c) I, II and III   d) II and III only

Ans. I and II only

3) _____ fits together with lipids to break them down.

a )Maltose b) sucrose d) tripase d) lipase

Ans. Lipase

4) Active site continuously changes it shapes until the substrate do not bind to it, is statement of.

a) Induce fit model b) Lock and key model

c) Fluid mosaic model d) Both “a” and “b”

Ans. Induce fit model

5) The lock and key model was postulated by

a )Emil Fischer  b) Daniel Koshland

Carolus Linnaeus d) Edward O. Wilson

Ans. Emil Fischer

6) Chemical reaction requires particular conditions to carry down at proper rate, especially.

a) Temperature and Nature b) Nature and Pressure

c) Nature and Structure d) Temperature and Pressure

Ans. Temperature and pressure

7) The pH level where the enzyme is most active is known as_____ pH.

a) standard b) equilibrium c) optimum d) neutral

Ans. Optimium

8) Rate of reaction will increase when temperature

a) Increases b) Decreases c) Below 10°C  d) Both “a” and “c”

Ans. Increases

9) Choose the correct statement regarding lock and key model.

a) Enzyme and substrate posses’ specific complementary geometric shapes.

b) Active site of enzyme is flexible

c) Active site continuously changes

d) All above statements are correct

Ans.Enzyme and substrate posses’ specific complementary geometric shapes.

10) The metabolic activity in which large molecules breakdown to small molecules is known as

a ) anabolism b) catabolism c) cannibalism d) none

Ans. Cannibalism

11) What should be the normal temperature of a human

a ) 37⁰C   b) 37K  c) 37⁰F   d) 370K

Ans. 37⁰C

12) the activation energy needed to break a glucose molecule initially requires energy of ___ATP molecules

a ) 3  b) 2  c) 4   d) 6

Ans. 2

13) Identify the inorganiccofactor

a)K¹  b) NAD  c) NADP  d) FAD

Ans. K¹

14) Enzymes are used in industries such as

a ) Paper b) Food c) Brewing d) All

Ans. All

15) Apart from one all others are factors affecting the activity of Enzymes

a) Substrate Concentration b) pressure

c) Temperature d) pH

Ans. Pressure

16) All are factors affecting enzyme activity except.

a )pH  b) Substrate concentration  c) Organic solvent

d )Temperature

Ans. Organic solvent

17) Select the mismatched

a )Proteases → Carbohydrate b) Lipases → Lipids

b )Trypsin → Protein d) All are correctly matched

Ans.All are correctly matched

18) The point where the enzyme is most active is known as

a ) Neutral pH b) Acidic pH  c) Basic pH d) Optimum pH

Ans. Optimum pH

19)   Enzymes are

a ) Steroid in nature b) Protein in nature

b )Lipid in nature d) Carbohydrate in nature

Ans. Protein in nature

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