Essay
When photosynthesis is fully operational under conditions of intense light, the pH of the thylakoid lumen may be as much as three full pH units lower than the stroma of the chloroplast. Does this mean that the hydrogen ion concentration in the lumen is greater or less than that of the stroma? How many more hydrogen ions are on the side of the thylakoid membrane with the higher concentration compared to the side with the lower concentration?
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