Single Choice

Select the correct option: The Z scheme of photophosphorylation follows the following sequence: PS II$$ \underset{A}{\rightarrow}e^{-}acceptor\underset{B}{\rightarrow} ETS \underset{B}{\rightarrow}PS \,I\underset{C}{\rightarrow}e^{-} acceptor\underset{D}{\rightarrow}NADP^{+}$$ Which of the following option for A, B, C and D transfer of electrons? A B C D

AA-Uphill; B-Downhill; C-Uphill; D-Downhill
Correct Answer
BA-Downhill; B-Uphill; C-Downhill; D-Uphill
CA-Downhill; B-Uphill; C-Uphill; D-Downhill
DA-Uphill; B- Downhill; C-Downhill; D-Uphill

Solution

A: The electron transfer from PS II to the electron acceptor is uphill.
B: The electron transfer from the electron acceptor to the electron transport system (ETS) and from the ETS to the PSI are both downhill.
C: The electron transfer from the PSI to the electron acceptor is uphill.
D: The electron transfer from the electron acceptor to NADP+ is downhill.
So, the correct answer is 'A-Uphill; B-Downhill; C-Uphill; D-Downhill'.

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