Question

The first electron acceptor in cyclic photo- phosphorylation is

• A. $Fd$
• B. $PQ$
• C. $PC$
• D. Cyt.b.

Answer 1

Answer: (A)

: During cyclic photophosphorylation, in photoact I high energy electrons move from P700 to $NAD{P}^{+}$ through ferredoxin (Fd), the first electron acceptor. When all of the $NAD{P}^{+}$ has been reduced, the ferredoxin transfers electrons back to P700 by cyclic route through many electron acceptors like PQ, cyt. b, PC etc.