In chemiosmosis, the proton (H+) moves from _.
Correct answer: C. Lumen to Stroma
- A. Stroma to Lumen
- B. Cytoplasm to Stroma
- C. Lumen to Stroma
- D. Stroma to cytoplasm
Explanation
Chemiosmosis is the process whereby protons move down their electrochemical gradient, i.e., from a region of higher concentration to a region of lower concentration. During this process, they move through ATP synthase, and their movement results in the coupling of ADP and inorganic phosphate to form ATP. In chloroplasts, the concentration of protons is greater in the thylakoid lumen relative to the stroma; hence, protons move across the semipermeable membrane from the lumen into the stroma.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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