-
question_answer1)
Who first used the term "enzyme'' [CPMT 2004]
A)
J.B. Sumner done
clear
B)
Kuhne done
clear
C)
Thompson done
clear
D)
Garnier done
clear
View Solution play_arrow
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question_answer2)
Who coined the term zymase for enzymes in yeast [BHU 2002]
A)
Kuhne done
clear
B)
Sumner done
clear
C)
Louis pasteur done
clear
D)
Edward Buchner done
clear
View Solution play_arrow
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question_answer3)
Enzymes are basically or All enzymes contain [CPMT 1975, 83; AFMC 1980, 87; CBSE PMT 2000; MHCET 2003; MP PMT 2000, 04, 05]
A)
Sugars done
clear
B)
Proteins done
clear
C)
Fats done
clear
D)
Vitamins done
clear
View Solution play_arrow
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question_answer4)
"Enzymes are proteins'', it was suggested by [BHU 1979]
A)
Miller done
clear
B)
Sumner done
clear
C)
Pasteur done
clear
D)
Leeuwenhock done
clear
View Solution play_arrow
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question_answer5)
Who got the Nobel prize working on enzymes in the year 1978 [MP PMT 1997]
A)
W. Arber and D. Nathans done
clear
B)
Nass and Nass done
clear
C)
R. Misra done
clear
D)
H.G. Khorana done
clear
View Solution play_arrow
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question_answer6)
Name the scientist who for the first time isolated and purified the enzyme urease in crystalline form from Jack bean (Canavalia ensiformis)
A)
Kuhne (1826) done
clear
B)
Hayashi (1826) done
clear
C)
Kurosawa (1926) done
clear
D)
Sumner (1926) done
clear
View Solution play_arrow
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question_answer7)
Which of the following is called "biological middle man''
A)
Hormone done
clear
B)
Vitamin done
clear
C)
Enzyme done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer8)
Who demonstrated that alcoholic fermentation was an enzymatic process
A)
Louis Pasteur done
clear
B)
Justus Liebeg done
clear
C)
Edward Buchner done
clear
D)
James Sumner done
clear
View Solution play_arrow
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question_answer9)
Enzymes were discovered for the first time in [Pb. PMT 1995]
A)
Yeast done
clear
B)
Maize done
clear
C)
Bacteria done
clear
D)
Algae done
clear
View Solution play_arrow
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question_answer10)
Who discovered 'co-enzymes' [CPMT 1989; RPMT 1992]
A)
James Sumner done
clear
B)
Fritz Lipmann done
clear
C)
Mayerhoff done
clear
D)
Edward Buchner done
clear
View Solution play_arrow
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question_answer11)
Which one of the following statements is true for the enzymes [MP PMT 1995; BVP 2002]
A)
All enzymes are proteins done
clear
B)
All proteins are enzymes done
clear
C)
All enzymes are not proteins done
clear
D)
All enzymes are vitamins done
clear
View Solution play_arrow
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question_answer12)
Enzyme are best defined as
A)
Catalysts done
clear
B)
Organo-catalysts done
clear
C)
Protein-catalysts done
clear
D)
Metallo-catalysts done
clear
View Solution play_arrow
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question_answer13)
In plants, enzymes are present [BHU 1985; CPMT 1987]
A)
Only in flowers done
clear
B)
Only in leaves done
clear
C)
In all the living cells of plant body done
clear
D)
Only in parenchyma done
clear
View Solution play_arrow
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question_answer14)
Biological catalysts are called [BVP 2001]
A)
Auxins done
clear
B)
Gibberellins done
clear
C)
Enzymes done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer15)
Enzymes are the polymers of [MP PMT 1994]
A)
Hexose carbon done
clear
B)
Fatty acids done
clear
C)
Amino acids done
clear
D)
Inorganic phosphate done
clear
View Solution play_arrow
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question_answer16)
Which of the following statements is not correct [BHU 1992]
A)
All enzymes are proteins done
clear
B)
All enzymes are biocatalysts done
clear
C)
All proteins are enzymes done
clear
D)
All enzymes are thermolabile done
clear
View Solution play_arrow
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question_answer17)
cAMP mediated 'Cascade model' of enzyme regulation was proposed by [AllMS 1986]
A)
Fischer done
clear
B)
Sutherland done
clear
C)
Sumner done
clear
D)
Koshland done
clear
View Solution play_arrow
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question_answer18)
Synthesis of enzymes take place by
A)
Transamination done
clear
B)
Deamination done
clear
C)
Translation done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer19)
Enzymes are absent in [CBSE PMT 2000; AFMC 2003]
A)
Algae done
clear
B)
Fungi done
clear
C)
Bacteria done
clear
D)
Virus done
clear
View Solution play_arrow
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question_answer20)
Which one of the following enzyme is not composed of simple proteins
A)
Amylase done
clear
B)
Pepsin done
clear
C)
Urease done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer21)
Enzymes are useful to plants because [CPMT 1984]
A)
They are building block of chlorophyll done
clear
B)
They are essential for the metabolic processes done
clear
C)
They enhance absorption of water and salts done
clear
D)
They are responsible for paratonic movements done
clear
View Solution play_arrow
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question_answer22)
Which of the following is not an attribute of enzymes [NCERT 1976; CPMT 1985]
A)
They are proteinaceous in nature done
clear
B)
They speed up the rate of biochemical reactions done
clear
C)
They are specific in nature done
clear
D)
They are used up in reactions done
clear
View Solution play_arrow
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question_answer23)
What is correct about enzymes [CPMT 1988]
A)
They are most active at\[pH\,\,7.0\] done
clear
B)
They are all amino acids done
clear
C)
They are all proteins done
clear
D)
They are most active at a temperature of\[{{0}^{o}}C\] done
clear
View Solution play_arrow
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question_answer24)
Enzymes are different from inorganic catalysts [CPMT 1986, 90]
A)
Not being used up in reactions done
clear
B)
Being proteinaceous in nature done
clear
C)
Having high diffusion rate done
clear
D)
Working at high temperature done
clear
View Solution play_arrow
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question_answer25)
The enzyme used for alcohol formation by fermantation is [MP PMT 1992; CPMT 2001]
A)
Invertase done
clear
B)
Lipase done
clear
C)
Amylase done
clear
D)
Zymase done
clear
View Solution play_arrow
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question_answer26)
Of the total enzymes present in the cell approximately how many occur in mitochondrion [CPMT 1977; JIPMER 1983]
A)
10% done
clear
B)
30% done
clear
C)
50% done
clear
D)
70% done
clear
View Solution play_arrow
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question_answer27)
An average living cell contains about
A)
More than 1000 enzymes done
clear
B)
More than 2000 enzymes done
clear
C)
More than 3000 enzymes done
clear
D)
More than 5000 enzymes done
clear
View Solution play_arrow
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question_answer28)
The catalytic efficiency of two different enzymes can be compared by the [CBSE PMT 2005]
A)
Formation of the product done
clear
B)
The pH of optimum value done
clear
C)
The Km value done
clear
D)
Molecular size of the enzyme done
clear
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question_answer29)
Which of the following is not a part of enzyme but it activates the enzyme [CBSE PMT 1989]
A)
K done
clear
B)
Zn done
clear
C)
Mg done
clear
D)
Mn done
clear
View Solution play_arrow
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question_answer30)
Huge amount of starch is deposited in potato tubers due to [CPMT 1977; DPMT 1979]
A)
Chemical condensation of sugars done
clear
B)
Enzymatic transformations done
clear
C)
Synthesis of starch in tubers done
clear
D)
Absorption of nutrients done
clear
View Solution play_arrow
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question_answer31)
Which one of the following is an enzyme
A)
Insulin done
clear
B)
Riboflavin done
clear
C)
Griseofulvin done
clear
D)
Lipase done
clear
View Solution play_arrow
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question_answer32)
An enzyme can be synthesised by chemically bonding together molecules of [AFMC 1994]
A)
Carbohydrates done
clear
B)
Amino acids done
clear
C)
Lipases done
clear
D)
CO2 done
clear
View Solution play_arrow
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question_answer33)
A dialysable non-protein organic substance which combines with apoenzyme to make a functional enzyme is
A)
Hormone done
clear
B)
Coenzyme or vitamin done
clear
C)
Proenzyme done
clear
D)
Prosthetic group done
clear
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question_answer34)
Most enzymes consist of two parts; these are
A)
Enzyme and substrate done
clear
B)
Enzyme and coenzyme done
clear
C)
Apoenzyme and enzyme done
clear
D)
Apoenzyme and prosthetic group done
clear
View Solution play_arrow
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question_answer35)
The protein part of enzyme is known as [MP PMT 1996; AIIMS 2000; BVP 2000]
A)
Holoenzyme done
clear
B)
Apoenzyme done
clear
C)
Isoenzyme done
clear
D)
All of the above done
clear
View Solution play_arrow
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question_answer36)
Enzyme complex is called
A)
Holoenzyme done
clear
B)
Apoenzyme done
clear
C)
Coenzyme done
clear
D)
Prosthetic group done
clear
View Solution play_arrow
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question_answer37)
When coenzyme is combined with apoenzyme, it is called [AIIMS 1990; CMC Vellore 1994]
A)
Cofactor done
clear
B)
Holoenzyme done
clear
C)
Substrate enzyme complex done
clear
D)
Vitamin A done
clear
View Solution play_arrow
-
question_answer38)
Non-protein part of an enzyme is known as [CPMT 1982; AFMC 1997; Orissa PMT 2002; BVP 2003]
A)
Holoenzyme done
clear
B)
Apoenzyme done
clear
C)
Coenzyme done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer39)
The enzyme, which combines with non-protein part to form a functional enzyme known as [BHU 2004]
A)
Co-enzyme done
clear
B)
Holoenzyme done
clear
C)
Apoenzyme done
clear
D)
Prosthetic group done
clear
View Solution play_arrow
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question_answer40)
Cofactor (prosthetic group) is a part of holoenzyme. It is [CBSE PMT 1997]
A)
Loosely attached inorganic part done
clear
B)
Accessory non-protein substance attached firmly done
clear
C)
Loosely attached organic part done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer41)
Organic compounds having transient association with apoenzyme are called
A)
Holoenzyme done
clear
B)
Coenzyme done
clear
C)
Prosthetic group done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer42)
Which of the following coenzyme is a derivative of pantothenic acid (Vitamin B complex)
A)
NAD done
clear
B)
NADP done
clear
C)
FAD done
clear
D)
CoA done
clear
View Solution play_arrow
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question_answer43)
Co-enzyme is [BHU 1994]
A)
Always a protein done
clear
B)
Often a vitamin done
clear
C)
Always an inorganic compound done
clear
D)
Often a metal done
clear
View Solution play_arrow
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question_answer44)
Coenzyme can function
A)
In association with a vitamin done
clear
B)
In association with an apoenzyme done
clear
C)
Independently of the apoenzyme done
clear
D)
In association with a protein done
clear
View Solution play_arrow
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question_answer45)
Which of the following is iron porphyrin coenzyme or cofactor [DPMT 1987]
A)
Cytochrome done
clear
B)
FAD done
clear
C)
CoA done
clear
D)
NAD done
clear
View Solution play_arrow
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question_answer46)
Substances which enhance reactions after combining with enzymes are called
A)
Prosthetic groups done
clear
B)
Coenzymes done
clear
C)
Inducers done
clear
D)
Inhibitors done
clear
View Solution play_arrow
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question_answer47)
FAD or FMN is a coenzyme. Which vitamin is incorporated into its structure [BHU 1987]
A)
Vitamin C done
clear
B)
Vitamin B1 done
clear
C)
Vitamin B6 done
clear
D)
Vitamin B2 (Riboflavin) done
clear
View Solution play_arrow
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question_answer48)
NADP is [BHU 1984]
A)
A coenzyme done
clear
B)
A part of tRNA done
clear
C)
An enzyme done
clear
D)
A part of rRNA done
clear
View Solution play_arrow
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question_answer49)
Which of the following is not a co-enzyme [CPMT 2004]
A)
NAD done
clear
B)
NADP done
clear
C)
FAD done
clear
D)
ATP done
clear
View Solution play_arrow
-
question_answer50)
Which of the following is a loosely bound coenzyme
A)
Cu done
clear
B)
Mn done
clear
C)
Zn done
clear
D)
Vitamin\[{{B}_{12}}\] done
clear
View Solution play_arrow
-
question_answer51)
Which one of the following is a coenzyme
A)
Nicotinamide done
clear
B)
Riboflavin done
clear
C)
Pantothenic acid done
clear
D)
All the above done
clear
View Solution play_arrow
-
question_answer52)
Which mineral element is essential for the activity of aconitase enzyme
A)
Magnesium done
clear
B)
Manganese done
clear
C)
Calcium done
clear
D)
Iron done
clear
View Solution play_arrow
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question_answer53)
Which one of the following metallic ion does not occur as prosthetic group in any enzyme
A)
Mg done
clear
B)
Cu done
clear
C)
Zn done
clear
D)
Ag done
clear
View Solution play_arrow
-
question_answer54)
Which mineral element is essential for the activity of enolase enzyme
A)
Copper done
clear
B)
Cobalt done
clear
C)
Zinc done
clear
D)
Boron done
clear
View Solution play_arrow
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question_answer55)
The prosthetic group (metallic cofactor) of various respiratory enzymes is
A)
Ca done
clear
B)
Fe done
clear
C)
Mg done
clear
D)
Mo done
clear
View Solution play_arrow
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question_answer56)
Cytochrome oxidase enzyme contains
A)
Magnesium done
clear
B)
Manganese done
clear
C)
Iron done
clear
D)
Cobalt done
clear
View Solution play_arrow
-
question_answer57)
Which of the following element inhibits the activity of sulphydryl enzyme
A)
Fe done
clear
B)
Cu done
clear
C)
Zn done
clear
D)
Pb done
clear
View Solution play_arrow
-
question_answer58)
Which one of the following enzyme contains Mn metallic ion as the prosthetic group [BHU 2000]
A)
Phosphatase done
clear
B)
Dehydrogenase done
clear
C)
Peptidase done
clear
D)
Catalase done
clear
View Solution play_arrow
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question_answer59)
Which one of the following enzyme contains Mo as prosthetic group
A)
Phosphatase done
clear
B)
Dehydrogenase done
clear
C)
Isomerase done
clear
D)
Nitrate reductase done
clear
View Solution play_arrow
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question_answer60)
In which one of the following enzymes, is copper necessarily associated as an activator [CBSE PMT 2004]
A)
Lactic dehydrogenase done
clear
B)
Tyrosinase done
clear
C)
Carbonic anhydrase done
clear
D)
Trytophanase done
clear
View Solution play_arrow
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question_answer61)
Which one of the following statements regarding enzyme inhibition is correct [CBSE PMT 2005]
A)
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein done
clear
B)
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme done
clear
C)
Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate done
clear
D)
Non-competitive inhibitors often bind to the enzyme irreversibly done
clear
View Solution play_arrow
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question_answer62)
Telomerase is an enzyme which is a [AIIMS 2005]
A)
Simple protein done
clear
B)
RNA done
clear
C)
Ribonucleoprotein done
clear
D)
Repetitive DNA done
clear
View Solution play_arrow
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question_answer63)
Which is not true for enzymes [AMU 2005]
A)
Enzyme is a complex structure of protein done
clear
B)
Enzyme can be regulated by specific molecules done
clear
C)
Enzyme is more sensitive for the changes of temperature and pH done
clear
D)
Enzyme functions as catalyst for various reactions done
clear
View Solution play_arrow
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question_answer64)
Many of the hydrolytic reactions are [BHU 2001]
A)
Reversible done
clear
B)
Irreversible done
clear
C)
Endothermic done
clear
D)
Exothermic done
clear
View Solution play_arrow
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question_answer65)
DNA polymerase enzyme is responsible for the synthesis of
A)
DNA from RNA done
clear
B)
DNA from DNA done
clear
C)
RNA from DNA done
clear
D)
RNA from RNA done
clear
View Solution play_arrow
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question_answer66)
Enzymes as they exist inside the cell are [MP PMT 1993]
A)
In solid form done
clear
B)
In crystalline form done
clear
C)
In colloidal form done
clear
D)
In solution form done
clear
View Solution play_arrow
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question_answer67)
Which one value is required for better enzymatic action [BHU 1995, 2000]
A)
High Ki done
clear
B)
Low Ki done
clear
C)
Low Km done
clear
D)
High Km done
clear
View Solution play_arrow
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question_answer68)
The cause of specificity of an enzyme is
A)
Its prosthetic group done
clear
B)
Sequence of amino acid in its primary structure done
clear
C)
Its secondary structure done
clear
D)
Its tertiary structure and coenzymes done
clear
View Solution play_arrow
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question_answer69)
An enzyme acts by [MP PMT 1992; AIEEE Pharma 2003]
A)
Reducing the energy of activation done
clear
B)
Increasing the energy of activation done
clear
C)
Decreasing the pH done
clear
D)
Increasing the pH done
clear
View Solution play_arrow
-
question_answer70)
To explain the mechanism of enzymatic action, who proposed "Lock and key hypothesis'' [CPMT 1996; MP PMT 1998; BHU 2000; RPMT 2002]
A)
Fischer done
clear
B)
Jacob done
clear
C)
Koshland done
clear
D)
Sumner done
clear
View Solution play_arrow
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question_answer71)
Who proposed the principal of "Induced fit" [BHU 1998]
A)
Jacob done
clear
B)
Fischer done
clear
C)
Koshland done
clear
D)
Laderberg done
clear
View Solution play_arrow
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question_answer72)
Km is related to [BHU 2000]
A)
Morphology done
clear
B)
ABO blood group done
clear
C)
ES complex done
clear
D)
Chromatography done
clear
View Solution play_arrow
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question_answer73)
Template theory of enzyme action is supported by [BVP 2003]
A)
Enzymes occur in living beings and speed up certain reactions done
clear
B)
Enzymes speed up reaction done
clear
C)
Enzymes determine the direction of reaction done
clear
D)
Compounds similar to substrate inhibit enemy activity done
clear
View Solution play_arrow
-
question_answer74)
Jacob and Monad named those enzymes allosteric whose activity is regulated by
A)
Substrate done
clear
B)
End product done
clear
C)
Coenzymes done
clear
D)
Prosthetic groups done
clear
View Solution play_arrow
-
question_answer75)
When an enzyme induced product inhibits enzymatic activity, inhibition is called
A)
Competitive inhibition done
clear
B)
Non-competitive inhibition done
clear
C)
Feedback inhibition done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer76)
Number of active sites in allosteric enzyme is [CPMT 2000]
A)
One done
clear
B)
Two done
clear
C)
Three done
clear
D)
Four done
clear
View Solution play_arrow
-
question_answer77)
Enzyme inhibition caused by a substrate analogue is
A)
Competitive done
clear
B)
Non-competitive done
clear
C)
Incompetitive done
clear
D)
Semi-competitive done
clear
View Solution play_arrow
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question_answer78)
Inhibitory effect of melonic acid on succinic dehydrogenase enzyme is [AIIMS 2003]
A)
Competitive inhibition done
clear
B)
Non-competitive inhibition done
clear
C)
Feedback inhibition done
clear
D)
Inhibition due to end product done
clear
View Solution play_arrow
-
question_answer79)
Competitive inhibitors (like malonate) alter
A)
Velocity of reaction done
clear
B)
Value of Km (Michelis constant) done
clear
C)
Active site done
clear
D)
Structure of enzyme done
clear
View Solution play_arrow
-
question_answer80)
Enzyme can be made functionless by
A)
Removing its product as fast as it is formed done
clear
B)
Doubling its concentration done
clear
C)
Decreasing its concentration done
clear
D)
Blocking its active site done
clear
View Solution play_arrow
-
question_answer81)
Metabolic poisons which alter the structure of an apoenzyme are
A)
Competitive inhibitors done
clear
B)
Substrate analogs done
clear
C)
Product inhibitors done
clear
D)
Non-competitive inhibitors done
clear
View Solution play_arrow
-
question_answer82)
Non-competitive inhibitors alter
A)
Structure of enzyme done
clear
B)
Structure of active site done
clear
C)
Velocity of enzymatic reaction done
clear
D)
All the above done
clear
View Solution play_arrow
-
question_answer83)
During glycolysis enzyme hexokinase changes glucose to glucose-6- phosphate. Glucose-6-phosphate is inhibited by [CBSE PMT 1996]
A)
Feedback inhibition done
clear
B)
Positive feedback done
clear
C)
Competitive inhibition done
clear
D)
Non-competitive inhibition done
clear
View Solution play_arrow
-
question_answer84)
Decline in the activity of the enzyme hexokinase by glucose 6 - phosphate is caused by [Kerala CET (Med.) 2003]
A)
Non-competitive done
clear
B)
Competitive inhibitions done
clear
C)
Allosteric modulator done
clear
D)
Denaturation of enzymes done
clear
View Solution play_arrow
-
question_answer85)
Enzymes capable of changing their form are called
A)
Apoenzyme done
clear
B)
Holoenzyme done
clear
C)
Isoenzyme done
clear
D)
Allostearic enzymes done
clear
View Solution play_arrow
-
question_answer86)
Lactose operon is considered to be glucose sensitive due to [DPMT 2003]
A)
Catabolite induction done
clear
B)
Allosteric inhibition done
clear
C)
Anabolic inhibition done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer87)
Which of the following enzyme can form RNA from DNA [MP PMT 1992]
A)
Restriction enzyme done
clear
B)
DNA polymerase done
clear
C)
RNA polymerase done
clear
D)
Reverse transcriptase done
clear
View Solution play_arrow
-
question_answer88)
The permeases are [MP PMT 2003]
A)
Structural membrane proteins done
clear
B)
Enzymatic membrane proteins done
clear
C)
Carrier membrane proteins done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer89)
Which enzyme shows greatest substrate specificity [CPMT 2005]
A)
Nuclease done
clear
B)
Trypsin done
clear
C)
Sucrase done
clear
D)
Pepsin done
clear
View Solution play_arrow