Metabolic reactions involve

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Breakdown of biomolecules only

Synthesis of some biomolecules only

All physical changes which occur in objects surrounding us

All biochemical reactions occurring inside an organism

answer is D.

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Detailed Solution

All living organisms are made of chemicals. These chemicals, small and big, belonging to various classes, sizes, functions, etc., are constantly being made and changed into some other biomolecules. These conversions are chemical reactions or metabolic reactions. There are thousands of metabolic reactions occurring simultaneously inside all living organisms, be they unicellular or multicellular. All plants, animals, fungi and microbes exhibit metabolism. The sum total of all the chemical reactions occurring in our body is metabolism.

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