CUET Preparation Today
Answer the question on the basis of passage given below: A colloid is a heterogenous system in which a substance is dispersed (dispersed phase) as fine particles in another substance called dispersion medium. Their particle size is intermediate between that of pure solutions (<1 nm) and suspension (>1000 nm). They are known for interesting properties such as enormous surface area, Tyndall effect, Brownian Motion etc. They are widely used in industries and day to day life. Some prominent uses of colloids are those in smoke precipitators, purification of water, medicines cleansers etc. |
Which of the following is true for enzyme catalytic reaction? |
It increases with increase in temperature. It decreases with decrease in temperature. Its activity is maximum at 298-310K Its activity is maximum at pH 8.5. |
Its activity is maximum at 298-310K |
The correct answer is Option (3) → Its activity is maximum at 298-310K. The correct statement for enzyme-catalyzed reactions is: Its activity is maximum at 298-310 K. Enzyme-catalyzed reactions typically have an optimal temperature range in which they exhibit the highest activity. For most enzymes in the human body and other biological systems, this range is 298-310 K (25°C to 37°C). At temperatures below this, enzyme activity decreases due to lower kinetic energy, and at temperatures higher than this, enzymes can become denatured and lose their activity. While enzyme activity may initially increase with rising temperature due to increased molecular motion and collision frequency, if the temperature rises beyond the optimal range, enzymes begin to denature, leading to a decline in catalytic activity. Enzyme activity decreases with a drop in temperature because the lower energy reduces the frequency of collisions between enzymes and substrates, slowing down the reaction. The optimal pH for enzyme activity varies depending on the specific enzyme. While some enzymes might have an optimal pH around 8.5, the statement is too specific to be generally applicable to all enzyme-catalyzed reactions. Conclusion: |
