8 Questions
In photosystem II, what causes the thylakoid space to become strongly positive with respect to the stroma?
Hydrogen ions (H+) accumulating within the thylakoid space.
What provides the energy to make ATP in the thylakoid membrane?
The difference in both charge and H+ ion concentration across the membrane (the gradient).
What protein complex allows H+ ions to pass through the thylakoid membrane?
ATP synthase.
How are H+ ions able to pass through ATP synthase?
The H+ concentration difference across the membrane powers ATP synthase to rotate, allowing H+ ions to pass through.
What does ATP synthase bind together to produce ATP?
ADP (adenosine diphosphate) and a phosphate group.
What is the role of hydrogen ions in the thylakoid space in photosystem II?
Hydrogen ions accumulate in the thylakoid space and create a positive charge gradient that provides the energy to produce ATP.
How does the ATP synthase protein complex generate ATP in the thylakoid membrane?
ATP synthase allows H+ ions to pass through it, powered by the H+ concentration difference. As it rotates, ATP synthase binds ADP and a phosphate group together to produce ATP.
What is the source of the hydrogen ions that accumulate in the thylakoid space?
The hydrogen ions are left behind from the splitting of water at the end of the electron transport chain.
Test your knowledge on photosystem II and the accumulation of hydrogen ions in the thylakoid space. Explore the process of water splitting and the resulting positive charge and H+ ion concentration gradient.
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