Question

question 10 of 10
what will most likely happen if the hydrogen pump protein in photosystem i is
not taking in enough h+ ions into the thylakoid?

a. an increase in co₂ absorption by the chloroplast
b. a decrease in the formation of nadph
c. a decrease in the production of adp
d. an increase in glucose production

Explanation:

In photosystem I, hydrogen ions (\(H^+\)) are involved in the electron - transport chain. NADPH is formed when electrons combine with \(NADP^+\) and \(H^+\). If there are not enough \(H^+\) ions (due to the hydrogen pump protein malfunction), there will be a decrease in the formation of NADPH.

• Option A: \(CO_2\) absorption is related to the Calvin cycle (light - independent reactions) and not directly to the hydrogen pump in photosystem I.
• Option C: ADP is produced when ATP is hydrolyzed. The hydrogen pump in photosystem I is more directly related to the formation of NADPH (in the light - dependent reactions) rather than ADP production.
• Option D: Glucose production is part of the Calvin cycle (light - independent reactions) which depends on the products of the light - dependent reactions (ATP and NADPH). But a lack of \(H^+\) in the thylakoid (due to the hydrogen pump issue) would first affect NADPH formation (in the light - dependent reactions) rather than directly increasing glucose production.

Answer:

B. A decrease in the formation of NADPH