Which statement describes the functioning of photosystem II?
A) Light energy excites electrons in the thylakoid membrane electron transport chain.
B) Photons are passed along to a reaction-center chlorophyll.
C) The P680 chlorophyll donates a pair of protons to NADP⁺, which is thus converted to NADPH.
D) The electron vacancies in P680⁺ are filled by electrons derived from water.
E) The splitting of water yields molecular carbon dioxide as a by-product.

Question

Quizplus · Accepted Answer

Photosystem II functions by using light energy to excite electrons in the thylakoid membrane electron transport chain. These electrons are then passed along to a reaction-center chlorophyll. The P680 chlorophyll donates a pair of electrons to a nearby electron acceptor, which sets off a series of redox reactions that eventually lead to the creation of ATP and NADPH. The electron vacancies in P680⁺ are then filled by electrons derived from water, which is split in a process called photolysis. This results in the release of oxygen as a by-product. The splitting of water does not yield molecular carbon dioxide as a by-product, so option E is incorrect.

Which Statement Describes the Functioning of Photosystem II