Question

multiple select question select all that apply which statements about chemiosmosis are true? the breakdown of water is essential for providing the protons (h⁺) necessary to drive atp synthesis during chemiosmosis. as hydrogen ions (protons) move through ion channels across the thylakoid membrane, atp is formed in the stroma. six carbon dioxide molecules combine with six 5 - carbon compounds to form twelve 3 - carbon molecules called 3 - phosphoglycerate. it is the mechanism by which atp is produced as a result of the flow of electrons down a concentration gradient. the chemical energy stored in atp and nadph is transferred to 3 - phosphoglycerate molecules to form high - energy molecules.

Explanation:

1. In chemiosmosis, the breakdown of water provides protons ($H^+$) which move through ion - channels across the thylakoid membrane to drive ATP synthesis, so the statement about water breakdown is true.
2. Protons move through ion - channels across the thylakoid membrane and ATP is formed in the stroma during chemiosmosis, so the statement about proton movement and ATP formation location is true.
3. The flow of electrons down a concentration gradient is part of the mechanism by which ATP is produced in chemiosmosis, so the statement about ATP production mechanism is true.
4. The combination of carbon dioxide with 5 - carbon compounds to form 3 - phosphoglycerate is part of the Calvin cycle, not directly related to the core aspects of chemiosmosis described here, so this statement is false.
5. The transfer of energy from ATP and NADPH to 3 - phosphoglycerate to form high - energy molecules is part of the Calvin cycle, not directly related to chemiosmosis, so this statement is false.

Answer:

The breakdown of water is essential for providing the protons ($H^+$) necessary to drive ATP synthesis during chemiosmosis.
As hydrogen ions (protons) move through ion channels across the thylakoid membrane, ATP is formed in the stroma.
It is the mechanism by which ATP is produced as a result of the flow of electrons down a concentration gradient.