Question

question 157 cellular respiration
to create atp in the light - dependent stage of photosynthesis, which mechanism is needed to allow the h+ ions to travel through the membrane of the chloroplast?
select one
oxidation
chemiosmosis
fermentation
cellular digestion

Explanation:

• Oxidation is a chemical reaction involving the loss of electrons, not directly related to \(H^+\) ion movement for ATP synthesis in the light - dependent stage.
• Chemiosmosis is the process where \(H^+\) ions flow through ATP synthase (a membrane - bound enzyme) down their concentration gradient. This flow of \(H^+\) ions provides the energy for ATP synthesis in the light - dependent stage of photosynthesis.
• Fermentation is an anaerobic process in cellular respiration (not related to the light - dependent stage of photosynthesis) that regenerates \(NAD^+\).
• Cellular digestion is related to the breakdown of substances within a cell (e.g., by lysosomes) and has no role in \(H^+\) ion - driven ATP synthesis in the light - dependent stage.

Answer:

B. Chemiosmosis