Which statement correctly describes why enzyme activity increases with increased enzyme concentration?
Correct answer: C. Collisions between enzyme and substrate molecules increase because more active sites are available
- A. Collisions between enzyme and substrate molecules increase because of increased kinetic energy.
- B. Collisions between enzyme and substrate molecules increase because of increased heat energy
- C. Collisions between enzyme and substrate molecules increase because more active sites are available
- D. Collisions between enzyme and substrate molecules increase because more substrate molecules are available
Explanation
Option C is correct as increased enzyme concentration allows for a higher frequency of effective "collisions between enzyme and substrate as well as more active sites available" for substrates; thus, enzyme activity rate increases.
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Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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