HELP ASAP !!!
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 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.

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. Hence, option D is correct.

what is the function of enzyme?

The majority of enzymes are proteins, some are Ribonucleic acid (RNA) molecules.

Enzyme or biocatalyst binds to a substrate form transient enzyme-substrate by declining activation energy to attain the transition site.

Enzymes can either determine in molar amounts or in terms of activity.

The measuring unit include one enzyme unit which refers to the amount of enzyme causing the transformation of 1μmole of substrate per minute at 25˚C under optimal conditions of measurement.

Secondly, the katal is a SI unit of enzyme activity which is the amount of enzyme used to catalyze conversion of 1 mole of substrate per second.

Hence, option D is correct.

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