NEET Biology Biomolecules / जैव-अणु Question Bank

done Introduction Properties Action and Inhibition of Enzyme Total Questions - 89

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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
  View Solution play_arrow

• 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

• 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

• 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

• 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

• 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
  View Solution play_arrow

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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