The given graphs show the effects of temperature and pH on enzyme activity.Which of the given statements CORRECTLY matches the point on the graphs with the description of enzyme activity?
Correct answer: A. At point I, hydrogen bonds are formed between enzyme and substrate
- A. At point I, hydrogen bonds are formed between enzyme and substrate
- B. At point II, kinetic energy of enzyme and substrate is the highest.
- C. At point III, peptide bonds in the enzyme begin to break
- D. At point IV, the enzyme is completely denatured
Explanation
The correct answer is Option A. At point I, the enzyme operates under optimal conditions, allowing for effective formation of enzyme-substrate complexes through hydrogen bonding. Option B is incorrect because while kinetic energy may be high, it can lead to enzyme instability rather than effectiveness. Option C is incorrect as peptide bonds breaking signifies extreme conditions leading to denaturation, not just reduced activity. Option D is incorrect because complete denaturation is a severe condition that might not correspond directly to point IV depending on the graph specifics.
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About Factors Affecting Enzyme Action
Enzyme activity changes with temperature, pH, substrate concentration and enzyme concentration because these factors affect molecular collisions and the active site. Questions also examine optimum conditions, denaturation and inhibition, while distinguishing a fall in activity caused by unsuitable conditions from permanent enzyme damage.
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