Multiple Choice
Where do the electrons that are excited in photosystem II come from?
a) CO2.
b) O2.
c) Glucose.
d) Photosystem I.
e) Water.
9. Photosynthesis
Light Reactions of Photosynthesis
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Where do the electrons entering photosystem II come from?
A
Chlorophyll molecules in the antenna complex
B
ATP
C
The electron transport chain
D
Light
E
Water
Verified step by step guidance1
Understand the role of photosystem II in photosynthesis. Photosystem II is the first protein complex in the light-dependent reactions of oxygenic photosynthesis.
Recognize that photosystem II is responsible for the initial step of capturing light energy and using it to extract electrons from water molecules.
Learn that the process of extracting electrons from water is known as photolysis. This involves splitting water molecules (H₂O) into oxygen, protons, and electrons.
Identify that the electrons extracted from water are then transferred to chlorophyll molecules in the reaction center of photosystem II.
Note that these electrons are energized by light absorbed by chlorophyll, allowing them to move through the electron transport chain, ultimately contributing to the formation of ATP and NADPH.
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