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Question
In a chloroplast, the highest number of protons are found in:
In a chloroplast, the highest number of protons are found in:
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Solution
The correct option is B Lumen of thylakoids
The thylakoid lumen is a continuous aqueous phase, enclosed by the thylakoid membrane. It plays an important role in photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4. The ATP synthase complex transports protons across the thylakoid from lumen to stroma. These protons flow down an electrochemical gradient and the energy released by that flow is trapped on the stroma side of the thylakoid membrane by ATP synthesis.
The thylakoid lumen is a continuous aqueous phase, enclosed by the thylakoid membrane. It plays an important role in photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4. The ATP synthase complex transports protons across the thylakoid from lumen to stroma. These protons flow down an electrochemical gradient and the energy released by that flow is trapped on the stroma side of the thylakoid membrane by ATP synthesis.
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