4
Question
How much energy in terms of ATP equivalents is consumed in the photosynthetic production of a mole of hexose?
How much energy in terms of ATP equivalents is consumed in the photosynthetic production of a mole of hexose?
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Solution
The correct option is D 54 ATP eq
In C3 plants 3 molecules of ATP and 2 molecules of NADPH2 are required per carbon atom fixed into sugars making the total requirement to produce one molecule of hexose sugar as 18 molecules of ATP and 12 molecules of NADPH2. Thus if we were to speak in ATP equivalents the requirement will be 18 plus 36 i.e., 54 ATP molecules. This is because one molecule of NADPH2 is equivalent to 3 molecules of ATP thus 12 molecules of NADPH2 are equivalent to 36 molecules of ATP.
In C3 plants 3 molecules of ATP and 2 molecules of NADPH2 are required per carbon atom fixed into sugars making the total requirement to produce one molecule of hexose sugar as 18 molecules of ATP and 12 molecules of NADPH2. Thus if we were to speak in ATP equivalents the requirement will be 18 plus 36 i.e., 54 ATP molecules. This is because one molecule of NADPH2 is equivalent to 3 molecules of ATP thus 12 molecules of NADPH2 are equivalent to 36 molecules of ATP.
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