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Chapter 19: Q19P (page 662)

Predict the effect of an uncoupler such as dinitrophenol (Fig. 18-29) on the production of ATP in a chloroplast.

Short Answer

Expert verified

The production of chloroplast ATP decreases because of the uncoupler.

Step by step solution

01

Function of 2, 4 DNP in the electron transport

2, 4 dinitrophenol (DNP) as an uncoupler, meaning it disconnects the oxidative phosphorylation from the electron transport by discharging the electrochemical gradient. This gradient is generated by electron transport.

02

Production of ATP synthesis

By offering a pathway other than ATP synthase for proton translocation, an uncoupler reduces the transmembrane proton gradient. As 2,4 dinitrophenol (DNP) disconnects the electron transport, there is will deficiency in the production of ATPproduction.

Hence, ATP synthesis in chloroplasts would be reduced.

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Most popular questions from this chapter

Predict the effect of adding myxothiazol, an inhibitor of electron transport in mitochondrial Complex III, to a suspension of chloroplasts exposed to light. Would either ATPorNADPH production be affected?

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Predict the effect of an uncoupler such as dinitrophenol (Fig. 18-29) on the production of NADPH in a chloroplast.

Calculate the free energy change for moving a proton from the thylakoid lumen to the stroma when ΔpH=3.4,Δφ=0, and T=250C
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