Choose the correct statement about metabolism.
Metabolism is the sum total of all the reactions that are happening in a living organism. It includes catabolism and anabolism. Catabolism or destructive metabolism is the process of the breakdown of molecules for releasing energy. It includes all the breakdown reactions which involve the formation of simpler substances from the complex substances. For example, during respiration, glucose breaks down to release energy and form carbon dioxide and water.
Anabolism or constructive metabolism is the process of synthesis of complex substances. It includes all the building up reactions and energy is required during this process. For example, during photosynthesis, carbon dioxide form sugars by using solar energy.
Metabolism is a defining feature of the living organisms and it can’t be seen in non-living things. It can be demonstrated outside the body in cell-free systems. An isolated metabolic reaction in vitro happens in non-living things but are living reactions.