Question

28) The graph below shows how the activity of an enzyme changes at different temperatures.

Which statement best describes what happens to the enzyme when the temperature of the
reaction increases to 63°C?
Enzyma Activity vs. Temperature
Enzyme Activity
increasing
0
10
TTTT
20 30 40 50 60 70
Temperature (°C)
a) The enzyme is used up and the reaction stops.
b) The enzyme begins to decrease the rate of the reaction.
(c) The enzyme continues to increase the rate of the reaction.
d) The enzyme changes shape and can no longer speed up the reaction.

Answer 1

d) The enzyme changes shape and can no longer speed up the reaction

Step-by-step explanation:

Enzymes aare protein in nature therefore sensitive to changes in temperature. Most enzymes have an optimum temperature ranging from 35-40°c. As the temperature increases, optimum temperature is reached where the rate of reaction is maximum. Temperatures above 40-63°c denatures the enzymes making them non effective thus the reaction decreases sharply.