One way of expressing the rate at which an enzyme can catalyze a reaction is to state its turnover number. The turnover number is the maximum number of substrate molecules that can be acted on by one molecule of enzyme per unit of time. The table gives the turnover number of four representative enzymes. Enzyme Ribonuclease Fumarase Lactate dehydrogenase Urease How many molecules of fumarate can one molecule of fumarase act on in 15.8 min? fumarate molecules: 948000 Substrate Turnover number (per second) RNA 100 fumarate 800 lactate 1000 urea 10,000 Incorrect Enter numeric value

Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the p…

The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique dist…