Question

The first electron carrier molecule from P${}_{700}$ to NADP${}^{+}$ is believed to be

• A. Cytochrome
• B. Cu protein or plastocyanin
• C. FeS protein or ferredoxin
• D. Fe-Mg protein

Answer 1

The correct option is C FeS protein or ferredoxin

The electrons from water molecule are ultimately used to reduce NADP thus synthesizing the reducing power, which will be used subsequently to reduce carbon dioxide. 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.

So, the correct answer is 'FeS protein or ferredoxin'