16 public questions tagged with this topic.
Competitive inhibitors compete with the substrate for the enzyme’s active site, reducing enzyme activity.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
In non-competitive inhibition, the inhibitor binds to a site other than the active site, altering the enzyme's function.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
Competitive inhibitors compete with the substrate by binding to the enzyme's active site. Non-competitive inhibitors bind elsewhere, and some inhibitors are reversible.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
Competitive inhibitors compete with the substrate by binding to the active site. Non-competitive inhibitors bind elsewhere, and some inhibitors are reversible.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
Enzymes work within specific pH and temperature ranges. Extreme conditions can denature them.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
T4 polynucleotide kinase possesses 5'-kinase activity transferring the gamma-phosphate of ATP to 5'-hydroxyl ends of DNA or RNA, plus 3'-phosphatase activity. Biochemical studies demonstrate that ammonium ions act as potent inhibitors, even at concentrations as low as a few millimolar, by interfering with active site conformation. Because many DNA purification protocols use ammonium acetate for precipitation, residual ammonium can block phosphorylation and subsequent ligation. Therefore, sodium acetate precipitation followed by ethanol washing is preferred before kinase treatment to ensure efficient 5'-end labeling and vector phosphorylation.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Increase Km is the accurate response regarding enzymatic activity or regulation described in this question. Enzymes are biological catalysts that accelerate reactions by lowering activation energy through specific substrate binding and transition state stabilization. In the context of Enzymes Basics, Increase Km plays a specific catalytic or regulatory role determined by its active site configuration and mechanism of action. The other options (Decrease Vmax, Bind to the allosteric site, and Change the enzyme’s conformation permanently) are either different enzymes with distinct substrate specificities, act through different mechanisms, or are involved in separate metabolic pathways.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
A site other than the active site is the scientifically accurate answer to this question. Within the study of Km and Vmax calculation, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of A site other than the active site directly address what is being asked. Among the other options, The active site, The substrate, and The enzyme-substrate complex only do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
Suicide inhibition is the accurate response regarding enzymatic activity or regulation described in this question. Enzymes are biological catalysts that accelerate reactions by lowering activation energy through specific substrate binding and transition state stabilization. In the context of Enzyme Inhibition, Suicide inhibition plays a specific catalytic or regulatory role determined by its active site configuration and mechanism of action. The other options (Non-competitive, Competitive, and Uncompetitive) are either different enzymes with distinct substrate specificities, act through different mechanisms, or are involved in separate metabolic pathways.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
Allosteric is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Enzyme Inhibition, the other options (Competitive, Uncompetitive, and Mixed) are all valid and well-established concepts. Allosteric is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
Sarin is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Enzyme Inhibition, the other options (Methotrexate, Sulfonamide, and Malonate) are all valid and well-established concepts. Sarin is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
[I] accurately defines or describes the concept asked in this question. Within Enzyme Inhibition, precise definitions and terminology are essential for clear scientific communication. The other options (1/[S], 1/Vmax, and Km/Vmax) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
