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
