Trace the path of a single electron through the noncyclic electron pathway by putting the following in order:
-1. The electron is excited in photosystem I.
-2. The electron is passed to the plastoquinone pool.
-3. The electron is excited in photosystem II.
-4. The electron is released from water and added to the photosystem.
-5. A proton gradient is generated by the cytochrome complex as the electron arrives and then departs
-6. The electron is transferred to NADP+.
1, 4, 5, 2, 1, 6
4, 3, 2, 5, 1, 6
3, 4, 2, 5, 1, 6
1, 4, 3, 6, 2, 5
1, 4, 6, 2, 1, 5
