Figure 10.1
-Which statement describes the functioning of photosystem II?
A)Light energy excites electrons in the electron transport chain in a photosynthetic unit.
B)The excitation is passed along to a molecule of P700 chlorophyll in the photosynthetic unit.
C)The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP⁺.
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

Figure 10.1 
-Which statement describes the functioning of photosystem II?
A)Light energy excites electrons in the electron transport chain in a photosynthetic unit. 
B)The excitation is passed along to a molecule of P700 chlorophyll in the photosynthetic unit. 
C)The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP⁺. 
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.

Quizplus · Accepted Answer

Photosystem II is responsible for the initial photoexcitation of electrons in the electron transport chain of photosynthesis. The electrons are excited by light energy and then passed along the chain until they reach P700 chlorophyll in photosystem I. The electrons lost by P680 chlorophyll are replenished by electrons derived from the splitting of water, which yields O2 as a by-product.

Figure 10.1 -Which Statement Describes the Functioning of Photosystem II