Enzymes catalyze chemical reactions: Biological molecules that accelerate reaction rates, enabling vital biochemical processes to occur within living organisms, often increasing reaction speed by factors up to 10^12–10^17 (Goldberg, 2025-26).
Enzyme specificity: The selective nature of enzymes for particular substrates, meaning each enzyme typically catalyzes only one specific reaction or acts on a specific substrate, which is crucial for metabolic regulation (Goldberg, 2025-26).
Isozymes: Variants of enzymes that catalyze the same reaction but differ in amino acid sequence, kinetics, and regulation, often expressed in different tissues or cellular compartments (Goldberg, 2025-26).
Hypothèse de l’équilibre rapide (Rapid equilibrium hypothesis): Assumes that the formation and dissociation of the enzyme-substrate complex reach equilibrium quickly relative to product formation, allowing for simplified kinetic equations (Goldberg, 2025-26).
1. What does the Michaelis constant (Km) represent in enzyme kinetics?
2. Who are the authors and the year associated with the development of the Michaelis-Menten reaction velocity model?
3. What is the role of temperature effects on enzyme activity?
Enzymes catalyze reactions?
They accelerate reaction rates in biological systems.
Enzyme specificity — role?
Ensures catalysis of specific substrates or reactions.
Isozymes — definition?
Variants of enzymes with different properties for same reaction.
Rapid equilibrium hypothesis — meaning?
Assumes quick formation/dissociation of enzyme-substrate complex.
Reaction velocity equations — basis?
Derived from Michaelis-Menten assumptions and rate constants.
Temperature effects — enzyme activity?
Increases to an optimum, then declines due to denaturation.
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