Question

The first electron carrier molecule from $P_{700}$ to $NAD{P}^{+}$ is believed to be:

• A. Cytochrome
• B. Cu protein/Plastocyanin
• C. FeS protein/Ferredoxin
• D. Fe-Mg protein

Answer 1

The correct option is C FeS protein/Ferredoxin

The reaction centre of PS I, on absorption of photons of light, releases electrons, which are captured by iron sulphur proteins. The iron sulphur proteins hand over the electrons to ferredoxin. The ferredoxin ultimately gives electrons to NADP during its reduction by ferredoxin NADP oxidoreductase.