Enzyme Catalysis and Reaction Rates — NEET Biology
📚 Practice ConceptRate can also be called velocity if the direction is specified. Rates of physical and chemical processes are influenced by temperature among other factors. A general rule of thumb is that rate doubles or decreases by half for every 10°C change in either direction. Catalysed reactions proceed at rates vastly higher than that of uncatalysed ones. When enzyme catalysed reactions are observed, the rate would be vastly higher than the same but uncatalysed reaction. For example
Which of the following statements correctly describe the factors affecting enzyme activity? S1. Increasing substrate concentration always linearly increases the velocity of the enzymatic reaction without limit. S2. Enzymes exhibit highest activity at an optimum temperature and pH, with activity declining both above and below these values. S3. Low temperatures can preserve enzymes in a temporarily inactive state, whereas high temperatures can denature them, causing irreversible loss of activity. S4. The active site of enzymes from thermophilic organisms typically denatures above 40°C, similar to human enzymes. S5. Specific chemicals called inhibitors can bind to enzymes and reduce their activity by altering their tertiary structure or competing for the active site.
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