Question

mini - quiz: temperature and enzymes
based off of your observations, which of the following statements would be true?
i. substrates (molecules) move faster at higher temperatures.
ii. faster moving substrates collide with the enzyme more, causing the reaction rate to increase until the optimal temperature is reached.
iii. hotter temperatures always result in faster reaction rates.
a. ii and iii only
b. i and ii only
c. i only
d. i, ii, and iii

Explanation:

• Statement I: According to kinetic - molecular theory, higher temperature means higher kinetic energy, so substrates move faster.
• Statement II: More frequent collisions between substrates and enzymes due to faster - moving substrates increase the reaction rate until the optimal temperature.
• Statement III: Temperatures above the optimal can denature enzymes, decreasing the reaction rate. So, it's false.

Answer:

B. I and II only