Which of the following statements are true about enzymes? Select all that apply. 1.Enzymes are not affected by changes in temperature or pH.
2.Enzymes make life possible because without them the chemical reactions that sustain life would occur too slowly.
3.An enzyme's active site is a specific shape.
4.Enzymes are changed after a chemical reaction and cannot be used again.
5.Enzymes lower the activation energy required for a reaction to occur.

The true statements about enzymes are :

An enzyme is a catalyst that speeds up the rate of chemical reaction occurring in living organisms without been used up at the end of the reaction. some of the functions of  Enzymes are :

Enzymes can be reused because they don't get used up in a chemical reaction. also changes in pH levels and temperature affects the effectiveness of enzymes in a reaction.

Hence we can conclude that the true statements about enzymes are : Enzymes make life possible because without them the chemical reactions that sustain life would occur too slowly , An enzyme's active site is a specific shape , Enzymes lower the activation energy required for a reaction to occur

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2, 3 and 5

Explanation:

Enzymes lower the activation energy, making life possible to occur as the reactions can happen quickly. But, they can be affected by temperature or pH, and they are always being constantly reused over and over in reactions.

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