The importance of hydron ions in developing a proton gradient that allows for ATP production

The hydrogen ions are allowed to pass through the thylakoid membrane through an embedded protein complex called ATP synthase. ... The energy generated by the hydrogen ion stream allows ATP synthase to attach a third phosphate to ADP, which forms a molecule of ATP in a process called photophosphorylation.

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rocks and weathering-matching

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.