Which of the statement about enzyme is true

Enzymes accelerate reactions by lowering the activation energy

Enzymes are proteins whose three- dimensional form is key to their function

Enzymes do not alter the overall change in free energy for a reaction

All of these

An enzyme is a substance that acts as a catalyst in living organisms.
It helps in regulating the rate at which chemical reactions proceed without itself being altered in the process.
The biological processes that occur within all living organisms are chemical reactions.
The most biological processes are regulated by enzymes.

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