Electron Transport in Photosynthesis

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Questions and Answers

The electron transport chain in photosynthesis moves electrons uphill in terms of redox potential.

False (B)

What is the name given to the pathway of electron transport in photosynthesis due to its zigzag shape?

Photosynthetic Electron Transport
The Z Scheme (correct)
The Electron Transport Chain
The Calvin Cycle

What is the role of Photosystem I (PSI) in the electron transport chain?

Photosystem I (PSI) absorbs light energy and transfers electrons to a molecule of NADP+.

The movement of electrons from PSII to PSI and finally to NADP+ is called the ______ scheme.

<p>Z</p> Signup and view all the answers

Match the following components of the electron transport chain with their respective descriptions:

<p>Photosystem II (PSII) = Absorbs light energy and transfers electrons to an electron acceptor. Cytochromes = A chain of electron carriers that facilitate electron transport. NADP+ = A molecule that is reduced to NADPH by accepting electrons from PSI.</p> Signup and view all the answers

Flashcards

Z scheme

The electron transport pathway from PSII to PSI to NADP+, characterized by its zigzag shape.

Photosystem II (PSII)

A component in photosynthesis that absorbs red light at 680 nm and excites electrons.

NADP+ reduction

The process of converting NADP+ to NADPH + H+ at the end of the electron transport.

Electron transport chain

A series of proteins that transfer excited electrons from acceptors to molecules like NADP+.

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Photosystem I (PSI)

The photosystem that absorbs red light at 700 nm, exciting electrons for further transfer.

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Study Notes

Electron Transport

Photosystem II (PSII) absorbs red light (680 nm wavelength)
This excites electrons, transferring them to an electron acceptor
The electron acceptor passes the electrons to a chain of cytochromes
This movement of electrons follows a redox potential scale, moving downhill
Photosystem I (PSI) pigments absorb red light (700 nm wavelength) exciting electrons
These electrons are transferred to another acceptor with a higher redox potential
Electrons move downhill, eventually reducing NADP+ to NADPH + H+
This electron transfer from PSII to PSI, and finally to NADP+, is called the Z-scheme, due to its zigzag shape
The Z-scheme is part of the assimilatory power transport system in chloroplast membranes