Question

1. at very high temperatures, most enzymes do not increase the rate of the reactions they regulate. what is the most likely reason for this lack of enzyme activity at very high temperatures? a the enzyme denatures and can no longer function properly. b the enzyme would have already been broken down at a much lower temperature. c the products would have already been used up in the reaction by the time it reaches that high temperature. d the enzyme would have already sped up the rate of reaction as much as it could and would not be affected by the increase in temperature. 9. which statement correctly describes a property of enzymes? a enzymes react at identical rates under all circumstances. b enzymes are destroyed and then reformed after each reaction. c enzymes form permanent structures when they bind to substrates. d enzyme structures are specific to the type of substrate they bond to.

Explanation:

1. Enzymes are proteins and high - temperature can cause them to denature, losing their 3 - D structure and function.
2. Enzyme activity is affected by factors like temperature, pH, etc., so they don't react at identical rates under all circumstances.

Answer:

1. D. The enzyme denatures and can no longer function properly.
2. A. Enzymes react at identical rates under all circumstances.