Question

mini - quiz: substrate concentration and enzymes. based on your observations, how does substrate concentration affect enzyme activity? i. there is more enzyme activity at higher substrate concentrations due to more collisions between enzyme and substrate, until a maximum reaction rate is reached. ii. once the maximum reaction rate for the enzyme is reached, the reaction rate levels off. iii. the reaction rate will always increase if substrate concentration is increased. a. i and iii only b. i, ii and iii c. i and ii only d. ii and iii only

Explanation:

Enzyme - substrate reactions follow a pattern. At first, more substrate leads to more collisions and higher activity until the enzyme is saturated (maximum reaction rate). Once saturated, adding more substrate doesn't increase the rate. Statement III is incorrect as the rate doesn't always increase with substrate concentration due to saturation.

Answer:

C. I and II only