How many ATPs are formed from $N A D P H$ to $N A D P^{+}$ ?

2 ATP

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3 ATP

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6 ATP

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4 ATP

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Solution

The correct option is B 3 ATP
$N A D^{+}$ and $N A D P^{+}$ are coenzymes that function in oxidation-reduction reactions. Both NAD and NADP are structurally similar but, NADP contains a phosphate group. NAD is mainly used in the cellular respiration and electron transport chain whereas NADP is used in the photosynthesis. When electrons from NADPH move through the transport chain, there is production of 3 ATP.

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Question 20
$3−phosphate+9ADP+6NADP++8Pi.3CO_2+9ATP+6NADPH+water \longrightarrow Glyceraldehyde~3-phosphate+9ADP+6NADP^++8Pi.$

Analyze the above reaction and answer the following questions.
How many molecules of ATP and NADPH are required to fix one molecule of $CO_2?$

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During what stage of photosynthesis are ATP and NADPH converted to ADP + Pi and NADP+?

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