Which step causes activation of catalytic site of an enzyme__________________?
Correct answer: B. Formation of Enzyme Susstrate complex.
- A. Change in pH of the surroundings.
- B. Formation of Enzyme Susstrate complex.
- C. Change in the charge of the active site.
- D. Change in temperature
Explanation
When an enzyme-substrate complex forms, interactions between the substrate and active site can produce induced fit, positioning catalytic groups correctly and activating the catalytic site. A student may choose a change in pH because pH alters enzyme charge, but pH change is an external factor and is not the normal activation step itself.
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About Mode of Enzyme Action
Enzyme action depends on the active site forming a temporary enzyme substrate complex, then converting substrate into products with lower activation energy. The lock and key and induced fit models explain specificity and binding, while cofactors and changes in enzyme shape can affect catalysis.
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