Which of the following best explains why enzymes are necessary for many cellular reactions?

a. enzymes change reactants from a solid to a liquid during the reactions.
b. the reactions are too slow to meet the needs of the cell of enzymes are missing.
c. the reactions take up too much space in the cell if enzymes are missing.
d. enzymes supply the oxygen necessary for the reactions.

The enzymes are necessary for many cellular reactions because reactions are too slow to meet the needs of the cell when enzymes are missing (Option b).

Enzymes are biological catalysts that act to speed up the rate of chemical reactions inside the cells.

When enzymes are missing, a cell cannot break down chemical compounds (i.e., substrates such as food molecules) completely.

For example, lactose intolerance is caused by the absence of lactase, a key enzyme responsible to break down lactose into glucose and galactose.

In conclusion, enzymes are necessary for many cellular reactions because reactions are too slow to meet the needs of the cell when enzymes are missing (Option b is correct).

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