Respuesta :
Answer:
Thylakoid space to the stroma
Explanation:
Electron transport chain occurs in both the mitochondria and the chloroplast which is involved in the process of ATP formation in the cell. The enzyme which catalyzes the reaction of the ATP formation is ATP synthase. The ATP synthase is composed of two subunits the CF₀ and CF₁.
The CF₁ is involved in the conversion of ADP to ATP due to the rotation of the rotor in the CF₁ unit which derives its energy from the flow of protons.
In chloroplast during the electron transport chain, the proton gets accumulated in the thylakoid lumen. These accumulated protons flow back from the thylakoid lumen towards the stroma of the chloroplast through CF₀ subunit of ATP synthase.
Thus, the selected option is correct.
In chloroplasts, an electron transport chain pumps protons from the stroma to the thylakoid space.
- Inside the chloroplasts are the thylakoids, membranous structures that have embedded an electron transport system and several chlorophyll molecules.
- When sunlight comes into contact with chlorophyll it causes some of its electrons to gain energy, thus the electronic excitation process encourages them to be transferred to an electron transport chain (system).
- In chloroplasts there is a fluid called stroma, which has a low concentration of hydrogen ions.
- When electrons pass through the transport chain from the stroma into the thylakoid lumen, they release their energy generating a concentration gradient of hydrogen ions between the interior of the thylakoid and the stroma.
Therefore, we can conclude that the transport of electrons in chloroplasts is the movement of protons from the stroma towards the lumen of the thylakoid, generating a pH gradient on both sides of the thylakoid membrane.
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