The number of substrate molecules converted into the product by one molecule of enzyme active site per unit time is called?
Correct answer: A. Turnover number
- A. Turnover number
- B. Substrate number
- C. Reaction number
- D. None of these options is correct.
Explanation
The turnover number (kcat) is defined as the number of substrate molecules converted into product by one molecule of enzyme active site per unit time when the enzyme is fully saturated with substrate. It represents the catalytic efficiency of an enzyme and is expressed in units of reciprocal time (e.g., per second).
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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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