Description : A demonstrable inducer is absent in (A) Allosteric enzyme (B) Constitutive enzyme (C) Inhibited enzyme (D) Co-operative enzyme ENZYMES 141
Last Answer : Answer : B
Description : In which of the following types of enzymes an inducer is not required? (A) Inhibited enzyme (B) Cooperative enzyme (C) Allosteric enzyme (D) Constitutive enzyme
Last Answer : Answer : D
Description : Which of the following is a microsomal enzyme inducer? (A) Indomethacin (B) Clofibrate (C) Tolbutamide (D) Glutethamide
Description : An enzyme of pyrimidine nucleotide biosynthesis sensitive to allosteric regulation is (A) Aspartate transcarbamoylase (B) Dihydroorotase (C) Dihydroorotate dehydrogenase (D) Orotidylic acid decarboxylase
Last Answer : Answer : A
Description : An enzyme which acts as allosteric regulator and sensitive to both phosphate concentration and to the purine nucleotides is (A) PRPP synthetase (B) PRPP glutamyl midotransferase (C) HGPR Tase (D) Formyl transferase
Description : Which inactivates an enzyme by occupying its active site? (A) Competitive inhibitor (B) Allosteric inhibitor (C) Non-competitive inhibitor (D) All of these
Description : Enzyme inhibition caused by a substance resembling substrate molecule is (A) Competitive inhibition (B) Non-competitive inhibition (C) Feedback inhibition (D) Allosteric inhibition
Description : Which one of the following regulatory actions involves a reversible covalent modification of the enzyme? (A) Phosphorylation of ser-OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition
Description : The shape of an enzyme and consequently its activity can be reversibly altered from moment to moment by (A) Heat (B) Amino acid substrate (C) Allosteric subunits (D) Sulfur substitutions
Last Answer : Answer : C
Description : Which of the following statements about an enzyme exhibiting allosteric kinetics with cooperative interaction is false? (A) A plot of V-Vk [s] has a sigmaidal shape (B) An inhibitor may increase the ... Km and Vmax (D) Removal of allosteric inhibitor may result in hyperbolic V-S [s] plot
Description : Which of the following regulatory reactions involves a reversible covalent modification of an enzyme? (A) Phosphorylation of serine OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition
Description : An allosteric enzyme influences the enzyme activity by (A) Competiting for the catalytic site with the substrate (B) Changing the specificity of the enzyme for the substrate (C) Changing the conformation ... binding to a site other than catalytic site (D) Changing the nature of the products formed
Description : Which of the following is an allosteric enzyme? (A) Phosphohexose isomerase (B) Phosphotriose isomerase (C) Lactate dehydrogenase (D) Phosphofructokinase
Description : Kinetics of an allosteric enzyme are explained by (A) Michaelis-Menten equation (B) Lineweaver-Burk plot (C) Hill plot (D) All of these
Description : An allosteric enzyme is generally inhibited by (A) Initial substrate of the pathway (B) Substrate analogues (C) Product of the reaction catalysed by allosteric enzyme (D) Product of the pathway
Description : An example of enzyme inhibition: (A) Reversible inhibition (B) Irreversible inhibition (C) Allosteric inhibition (D) All of these ENZYMES 151
Description : In gluconeogensis, an allosteric activator required in the synthesis of oxaloacetate from bicarbonate and pyruvate, which is catalysed by the enzyme pyruvate carboxylase is (A) Acetyl CoA (B) Succinate (C) Isocitrate (D) Citrate
Description : The rate of citric acid cycle is controlled by the allosteric enzyme: (A) Aconitase (B) Fumarase (C) Fumarase (D) Malate dehydrogenase
Description : An allosteric enzyme responsible for controlling the rate of T.C.A cycle is (A) Malate dehydrogenase (B) Isocitrate dehydrogenase (C) Fumarase (D) Aconitase
Last Answer : B
Description : Which of the following compound is a positive allosteric modifier of the enzyme pyruvate carboxylase? (A) Biotin (B) Acetyl CoA (C) Oxaloacetate (D) ATP
Last Answer : A
Description : ATP is a co-substrate as well as an allosteric inhibitor of (A) Phosphofructokinase (B) Hexokinase (C) Glucokinase (D) None of these
Description : Cimetidine interacts with more drugs than ranitidine because; a) It is subjected to greater first pass metabolism b) It is a more potent enzyme inducer c) It is a more potent enzyme inhibitor d) It has better oral absorption
Last Answer : c) It is a more potent enzyme inhibitor
Description : A sigmoidal plot of substrate concentration ([S]) verses reaction velocity (V) may indicate (A) Michaelis-Menten kinetics (B) Co-operative binding (C) Competitive inhibition (D) Non-competitive inhibition
Description : .In negative operon, (a) co-repressor binds with repressor (b) co-repressor does not bind with repressor (c) co-repressor binds with inducer (d) cAMP have negative effect on lac operon. (
Last Answer : co-repressor binds with repressor
Description : Which of the following genes of the E.coli “Lac operon” codes for a constitutive protein? (A) The ‘a’ gene (B) The ‘i’ gene (C) The ‘c’ gene (D) The ‘z’ gene
Description : The gene of lac operon which has constitutive expression is (A) i (B) c (C) z (D) p
Description : Enzymes which are always present in an organism are known as (A) Inducible enzymes (B) Constitutive enzymes (C) Functional enzymes (D) Apoenzymes
Description : What are constitutive enzymes?
Last Answer : Enzymes whose concentration in a cell is independent of inducer are called constitutive enzymes.
Description : Debranching enzyme is absent in (A) Cori’s disease (B) Andersen’s disease (C) Von Gierke’s disease (D) Her’s disease
Description : A substance unrelated to substrate but capable of reversibly changing activity of enzyme by binding to a site other than active site is called (a) Competitive inhibitor (b) Non-competitive inhibitor (c) Catalytic inhibitor (d) Allosteric modulator/inhibitor
Last Answer : Ans. ((d))
Description : Allosteric enzymes are A- larger than simple enzyme B- smaller than simple enzyme C- larger and more complex than simple enzyme D- .smaller than simple enzyme but not complex
Last Answer : larger and more complex than simple enzyme
Description : The organophosphates produce irreversible inhibition of cholinesterase because: A. They bind to an allosteric site of the enzyme resulting in unfavourable conformation of esteratic site to bind ... degradation of enzyme molecules D. They are neither metabolized nor excreted from the body
Last Answer : B. Regeneration time of the phosphorylated enzyme is longer than the turnover time of the enzyme molecules
Description : Social forestry is – (1) growing different types of plants together on private land (2) management of forest by co-operative societies (3) growing one type of plant in government owned land (4) growing and management of useful plants on government owned land
Last Answer : (4) growing and management of useful plants on government owned land Explanation: Social forestry means the management and protection of forests and afforestation on barren lands with the purpose ... as part of a drive towards afforestation, and rehabilitating the degraded forest and common lands.
Description : Which one of the following binds to specific nucleotide sequences that are upstream and most distant from the start site? (A) RNA polymerase (B) Repressor (C) Inducer (D) Restriction
Description : In the ’lac operon’ concept, which of the following is a protein? (A) Operator (B) Repressor (C) Inducer (D) Vector
Description : Which one of the following binds to specific nucleotide sequences? (A) RNA polymerase (B) Repressor (C) Inducer (D) Restriction
Description : The enzymes encoded by z, y and a genes of lac operon are inducible, and their inducer is (A) Lactose (B) Allo-lactose (C) Catabolite gene activator protein (D) All of these
Description : Positive control of induction is best described as a control system in which an operon functions (A) Unless it is switched off by a derepressed repressor protein (B) Only after a repressor protein is ... on (D) Only after an inducer protein, which is activated by an inducer, switch it on
Description : In the lac operon concept, a protein molecule is (A) Operator (B) Inducer (C) Promoter (D) Repressor
Description : Do you think that the 'Rochdale Pioneers', the originators of what we know as 'The Co-operative Movement' should be better known?.
Last Answer : I do now.
Description : In India, in which sector was the co-operative movement initiated ? -Do You Know?
Last Answer : answer:
Description : In which does the subject of Co-operative Societies fall? -Do You Know?
Description : Differences between parasternal and co operative?
Last Answer : difference in differences uses panel data to measure the differences
Description : What is a co-operative society ?
Last Answer : A co- operative society is an organization which is formed under the customary law of the country by a group of persons who have voluntarily joined together on the basis of equal rights for mutual material welfare .
Description : What is a Co-operative Society?
Last Answer : What is a Co-operative Society?
Description : Secretary of a Co-operative Society and Personal Secretary.
Last Answer : Distinguish between the following : Secretary of a Co-operative Society and Personal Secretary.
Description : Secretary of a Joint Stock Company and Secretary of a Co-operative Society.
Last Answer : Distinguish between the following : Secretary of a Joint Stock Company and Secretary of a Co-operative Society.
Description : Which one of the following statements is false ? (A) The Open Market Operations involve the sale or purchase of govt. securities by the Central Bank (B) The RBI manages longterm liquidity through ... change the proportion of govt. securities held by the RBI, Commercial Banks and Co-operative Banks
Last Answer : Answer: The RBI manages longterm liquidity through rapos
Description : ‘Self-help by mutual help’ is a feature of– (A) Public enterprise (B) Public corporation (C) Co-operative society (D) All of the above
Last Answer : Answer: Co-operative society