Why is photosystem II named before photosystem I?
Photosystem II Function: The P680 Reaction Center

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Science, Biology, Chemistry, Physics
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It was named after a scientist.
It was discovered first.
It was discovered after photosystem I.
It absorbs light at a higher wavelength.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the special pair of chlorophyll molecules in the P680 reaction center?
They absorb water.
They donate electrons.
They produce oxygen.
They reflect light.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to P680 when it donates an electron?
It releases oxygen.
It forms an electron hole.
It becomes negatively charged.
It splits water.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does P680 replenish its lost electrons?
By capturing oxygen.
By using stored energy.
By splitting water molecules.
By absorbing more light.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the free energy change for the oxidation of water to oxygen?
Negative and unfavorable.
Negative and favorable.
Positive and unfavorable.
Zero and neutral.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the cytochrome b6f complex in photosystem II?
It splits water.
It pumps protons.
It absorbs light.
It captures oxygen.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is another name for the water-splitting complex?
Oxygen-releasing complex.
Electron-donating complex.
Oxygen-evolving complex.
Water-absorbing complex.
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