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#Michaelis-Menten kinetics

3 public questions tagged with this topic.

Enzyme Kinetics

A reaction that follows Michaelis-Menten kinetics will reach 90% of Vmax at what substrate concentration?

9 Km is the scientifically accurate answer to this question. Within the study of Enzyme Kinetics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of 9 Km directly address what is being asked. Among the other options, 5 Km, 1 Km, and 18 Km 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

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Enzyme Kinetics

If an enzyme has a low Km, it means:

The enzyme has high affinity for the substrate 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 Kinetics, The enzyme has high affinity for the substrate plays a specific catalytic or regulatory role determined by its active site configuration and mechanism of action. The other options (The enzyme has low affinity for the substrate, The enzyme cannot reach Vmax, and The reaction is independent of substrate concentration) 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

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Enzyme Kinetics

Which of the following is not an assumption of Michaelis-Menten kinetics?

The product formation is a reversible reaction is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Enzyme Kinetics, the other options (The enzyme concentration remains constant, The substrate concentration is much higher than enzyme concentration, and The rate of enzyme-substrate formation is equal to its breakdown) are all valid and well-established concepts. The product formation is a reversible reaction 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

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