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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: are exclusively synthesized in the body of a living organism as at present

Solution

Enzymes, vitamins, and hormones are synthesized by living organisms, but some can be obtained through diet.

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