Concept:The rate of an enzyme-catalyzed reaction is directly proportional to the enzyme concentration, provided the substrate concentration is unlimited.
Solution:- Every enzyme molecule contains an active site where catalysis occurs.
- Therefore, increasing the number of enzyme molecules directly increases the number of available active sites.
- More active sites mean more substrates can be processed simultaneously, increasing the reaction rate.
Why other options are incorrect:While binding sites are part of the active site, 'active sites' is the more comprehensive and standard biological answer. Enzyme concentration does not change the activation energy barrier itself, nor does it magically create products without substrate conversion.
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