Question

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

Short answer

The production of chloroplast ATP decreases because of the uncoupler.

Step-by-step solution

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.

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.