The catalytic efficiency of two different enzymes can be compared by the :
Correct answer: C. Km value
- A. Formation of the product
- B. pH of optimum value
- C. Km value
- D. Molecular size of the enzyme.
Explanation
Km value or Michaelis constant is defined as the substrate concentration at which half of the enzyme molecules are forming (ES) complex or concentration of the substrate when the velocity of the enzyme reaction is half the maximal possible. The Km varies from enzyme to enzyme and is used in characterizing the different enzymes. A smaller Km value indicates greater affinity of the enzyme for its substrate, hence, shows a quicker reaction. Km value is a constant characteristic of an enzyme for its conversion of a substrate.
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Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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