The correct answer is (3) Both X and Y are specific for the substrate, S. Introduction Substrate specificity is a key property for enzymes, defining their role in cellular metabolism and […]
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CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Lineweaver-Burk Plot Analysis for Km Determination in Reversible Non-Competitive Enzyme Inhibition
The correct answer is (1). Introduction Enzyme inhibition is a cornerstone of biochemistry and pharmacology, and visualizing its effects on kinetic parameters is essential. The Lineweaver-Burk double reciprocal plot provides a […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Non-Competitive Enzyme Inhibition: Effects on Kinetic Parameters VmaxVmax and KmKm
(JUNE 2002) 66. Which of following is true for non-competitive inhibition? (1) Increases Vmax (2) Decreases Vmax (3) Increases Km (4) Decreases Km The correct answer is (2) Decreases Vmax. Introduction […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Noncompetitive Enzyme Inhibition: Reaction Schemes, Mechanism, and Impact on Kinetics
The correct answer is (2) E+S ⇄ ES → E+P; ES+I ⇄ ESI. Introduction Noncompetitive inhibition is a fundamental model in enzyme kinetics, describing how inhibitors can reduce enzyme activity regardless […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Understanding Competitive Inhibition: How Substrate Concentration Overcomes Inhibition
(DEC 2001) 64. False statement of competitive inhibition is- (1) Structure same as substrate (2) Inhibits substrate binding (3) Binds to active site (4) Reaction cannot be favorably biased by […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Understanding Enzyme Inhibition: Why Competitive Inhibition Increases KmKm but Not VmaxVmax
(JUNE 2004) 63. During inhibition of enzyme action Vmax remains unchanged while Km is increased. Inhibition is- (1) Competitive (2) Non-competitive (3) Un-competitive (4) Allosteric The correct answer is (1) Competitive. […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Mechanism-Based (Suicide) Inhibition in Enzyme Catalysis: Penicillin’s Site of Action Explained
The correct answer is (2) K₂. Introduction Mechanism-based (suicide) inhibitors are among the most potent and specific enzyme inhibitors in biochemistry and pharmacology. Penicillin serves as a classical example, irreversibly inactivating […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Covalent Enzyme Modification and Transition State Analogs: Key Mechanisms in Enzyme Inhibition
The correct answer is (4) The given brominated compound binds to triose phosphate isomerase at the active site and covalently modifies a glutamic acid residue required for enzyme activity. Introduction Enzyme […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
Enzyme Inhibition by Heavy Metals and Catalytic Activity of Monoclonal Antibodies: Clarifying Common Misconceptions
(DEC 2017) 60. Indicate the INCORRECT statement from the following: (1) Allosteric enzymes function through reversible noncovalent binding of allosteric modulators or effectors. (2) Monoclonal antibodies that catalyze hydrolysis of […]
CSIR NET Life Science Previous Year Questions and Solution on Biochemistry
How Reaction Products Inhibit Enzyme Catalysis: Mechanisms and Impact
(DEC 2014) 59. Reaction products inhibit catalysis in enzymes by (1) covalently binding to the enzyme. (2) altering the enzyme structure (3) occupying the active site. (4) form a complex […]
