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The mechanism of phosphorylation is depicted in the diagram below. Study it carefully and mark the correct option.

1. The diagram depicts photosynthetic phosphorylation taking place in the chloroplast. The incident light should be shown in the diagram
2. The diagram depicts oxidative phosphorylation taking place in mitochondria. However, the flow of electrons should be shown in the reverse direction
3. Diagram depicts the basic process of both oxidative as well as photosynthetic phosphorylation. However, the proton concentration should be high inside and low outside
4. The diagram correctly depicts the oxidative phosphorylation occuring in all heterotrophic isms

Correct answer: Diagram depicts the basic process of both oxidative as well as photosynthetic phosphorylation. However, the proton concentration should be high inside and low outside

Solution

The diagram represents the common mechanism used in both oxidative and photosynthetic phosphorylation: an electron transport chain builds a proton gradient that drives ATP synthase. The incorrect part is the proton distribution; in these systems, protons accumulate on one side of the membrane, creating a high-to-low gradient across it.

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