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Question
During oxidation within a cell, all the energy contained in respiratory substrate, is
During oxidation within a cell, all the energy contained in respiratory substrate, is
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Solution
The correct option is D Not released free into cell
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 released in a series of slow step-wise reactions controlled by enzymes, and it is trapped as chemical energy in the form of ATP. Hence, it is important to understand that the energy released by oxidation in respiration is not (or rather cannot be) used directly but is used to synthesise ATP, which is broken down whenever (and wherever) energy needs to be utilised. Hence, ATP acts as the energy currency of the cell.
So, the correct answer is "option A"
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 released in a series of slow step-wise reactions controlled by enzymes, and it is trapped as chemical energy in the form of ATP. Hence, it is important to understand that the energy released by oxidation in respiration is not (or rather cannot be) used directly but is used to synthesise ATP, which is broken down whenever (and wherever) energy needs to be utilised. Hence, ATP acts as the energy currency of the cell.
So, the correct answer is "option A"
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