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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these -
A
Are exclusively synthesized in the body of a living organism as at present
B
Enhance oxidative metabolism
C
Are conjugated proteins
D
Help in regulating metabolism
Detailed Solution
Enzymes are biocatalysts that speed up and control the rates of metabolic reactions.
Vitamins act mostly as coenzymes or their precursors, without which many enzymes cannot work.
Hormones are chemical messengers that regulate the activities of target cells and organs.
So all three help in regulating metabolism, which is why they can be grouped together.
They are not all synthesised in the body (most vitamins must be obtained from the diet), they are not all proteins (vitamins and steroid hormones are not), and they do not all enhance oxidative metabolism.
So the common feature is that they help in regulating metabolism.
Vitamins act mostly as coenzymes or their precursors, without which many enzymes cannot work.
Hormones are chemical messengers that regulate the activities of target cells and organs.
So all three help in regulating metabolism, which is why they can be grouped together.
They are not all synthesised in the body (most vitamins must be obtained from the diet), they are not all proteins (vitamins and steroid hormones are not), and they do not all enhance oxidative metabolism.
So the common feature is that they help in regulating metabolism.