Plastocyanin, Ferredoxin, and Ferredoxin NADP+ Oxidoreductase (Photosynthesis Part 5)

The video tutorial explains the process of electron transfer in Photosystem 1, focusing on the roles of P700, plastocyanin, and ferredoxin. It describes how light energy is absorbed by antenna molecules and transferred to P700, which then donates electrons through a series of acceptors, including phylloquinone and iron-sulfur centers, ultimately reaching ferredoxin. The tutorial also covers the regeneration of P700 by plastocyanin and the function of ferredoxin-NADP+ reductase in producing NADPH.

What is the role of plastocyanin in Photosystem 1?

• It acts as a primary electron acceptor.

• It transfers protons across the membrane.

• It donates electrons to P700.

• It absorbs light energy.

What happens when P700 is excited in Photosystem 1?

• It releases oxygen.

• It transfers an electron to a sub zero.

• It splits water molecules.

• It absorbs carbon dioxide.

Which molecule accepts electrons from P700 in Photosystem 1?

• NADPH

• A sub zero

• Phylloquinone

• Ferredoxin

What is the role of phylloquinone in Photosystem 1?

• It splits water molecules.

• It transfers electrons to iron-sulfur centers.

• It generates ATP.

• It absorbs light energy.

How does ferredoxin contribute to the formation of NADPH?

• By splitting water molecules.

• By transferring electrons to NADP+ directly.

• By absorbing light energy.

• By donating electrons to FAD, forming FADH.

What is the final product formed when ferredoxin transfers electrons to FAD?

• NADPH

• ATP

• Water

• Oxygen

What happens to ferredoxin after it donates electrons to FAD?

• It becomes oxidized and can accept more electrons.

• It splits water molecules.

• It is permanently reduced.

• It releases oxygen.