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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

1. help in regulating metabolism
2. are exclusively synthesized in the body of a living organism as at present
3. are conjugated proteins
4. enhance oxidative metabolism

Correct answer: help in regulating metabolism

Solution

Enzymes, vitamins, and hormones all participate in controlling and coordinating biochemical activities in the body. They are grouped together here because they help regulate metabolism, even though they differ in structure and origin.

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