Question : What is respiration ? Explain aboutrespiratory substrates .

1.	Question : What is respiration ? Explain aboutrespiratory substrates .
Answer» Solution :In Eukaryotes the breakdown of complex molecules to yield energy TAKES place in the cytoplasm and in the mitochondria. The breaking of C C- bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy is CALLED respiration. Respiratory substrates : The compounds thatare oxidised duringthis process are known as resplratory substrates . Proteins, fats and even organic acids can be usedas respiratory substances in some plants under certain conditions. During oxidation within a cell, all the energy contained in respiratory substrates is not RELEASED free into the cell or in a single step . It is trapped as chemical energy in the form of ATP. This ATP is broken down whenever energy needs to be utillized. Hence , ATP acts as the energy currency of the cell. Thisenergy trapped in ATP is UTILISED in various energy requiring processesof the organisms . The carbon skeleton produced during respiration is used as PRECURSORS for biosynthesis of other molecules in the cell.

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