Question

why does the rate of enzyme activity increase as this approaches 40? a. there are more collisions between the enzyme and substrate b. the enzyme became denatured c. because there is less kinetic energy d. there is more enzyme present
which of the following affects the rate of an enzyme - catalyzed reaction? a. ph b. temperature c. substrate and enzyme concentration d. all of the above
the following graph shows the effect of altering a factor on the rate of an enzyme - controlled reaction. what is shown on the x - axis? a. enzyme concentration b. temperature c. substrate concentration d. ph
what happens to enzyme activity around 63? a. the enzyme begins to decrease the rate of the reaction b. the enzyme continues to increase the rate of the reaction c. the enzyme changes shape d. the enzyme is used up

Explanation:

• Q1: Enzyme - catalyzed reaction rates are affected by pH, temperature, substrate and enzyme concentration. So all factors are correct.
• Q2: The graph shows enzyme activity changing with a factor on the x - axis. Temperature can cause such a bell - shaped curve for enzyme activity.
• Q3: As temperature approaches 40 (optimal temperature for many enzymes), there are more collisions between enzyme and substrate, increasing reaction rate.
• Q4: Around 63, enzymes denature (lose their shape and function), decreasing the reaction rate.

Answer:

Q1: D. All of the above
Q2: B. Temperature
Q3: A. There are more collisions between the enzyme and substrate
Q4: C. The enzyme changes shape (denatured)