As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find that 30,000 molecules of ATP were consumed, but only 20,000 molecules of NADPH were consumed. Where did the extra ATP molecules come from

When light reacts with chlorophyll molecules during photosynthesis, there is an excitement of electrons causing an energy increase and they are passed into the cyclic electron flow.

Cyclic electron flow is observed in the chloroplasts of green plants. It results in the production of ATP but not O2 or NADPH.

This cyclic pathway may be used when a plant has enough NADPH but requires synthesis of ATP.

This is the source of the additional ATP.

luisvaschetto luisvaschetto · Answer 2 · 2021-10-31T03:39:49+01:00

The extra ATP molecules consumed during the Calvin cycle come from the CYCLIC ELECTRON FLOW.

The cyclic electron flow is a pathway that produces supplementary molecules of ATP in order to meet the ATP:NADPH requirement.

The cyclic electron flow occurs when the Calvin cycle becomes slow due to the linear electron flow cannot produce enough ATP compared to the volume of NADPH.

This pathway (cyclic electron flow) uses the photosystem I complex to recycle electrons and thus generate a proton gradient, which is subsequently used to generate more ATP as a by-product.

In conclusion, the extra ATP molecules consumed during the Calvin cycle come from the CYCLIC ELECTRON FLOW.

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