[Campbell Biology P.246] According to the description of linear electron flow, what is the p... | Practice Question

According to the description of linear electron flow, what is the primary role of the enzyme that catalyzes the splitting of a water molecule photolysis in Photosystem II, especially concerning P680+?

  • A: To directly generate ATP for cellular energy.
  • B: To release O2 as a byproduct into the atmosphere.
  • C: To provide electrons that replace those lost by P680+ to the primary electron acceptor.
  • D: To pump H+ ions from the thylakoid space into the stroma.

Explanation

Step 3 of the linear electron flow description states: 'An enzyme catalyzes the splitting of a water molecule into two electrons, two hydrogen ions H+ , and an oxygen atom. The electrons are supplied one by one to the P680+ pair, each electron replacing one transferred to the primary electron acceptor. P680+ is the strongest biological oxidizing agent known; its electron 'hole' must be filled. This greatly facilitates the transfer of electrons from the split water molecule. '