In what order do the following five steps occur in the photochemical reaction centers?
1)Excitation of the chlorophyll a molecule at the reaction center
2)Replacement of the electron in the reaction center chlorophyll
3)Light excitation of antenna chlorophyll molecule
4)Passage of excited electron to electron-transfer chain
5)Exiton transfer to neighboring chlorophyll

Question

In what order do the following five steps occur in the photochemical reaction centers? 
1)Excitation of the chlorophyll a molecule at the reaction center
2)Replacement of the electron in the reaction center chlorophyll
3)Light excitation of antenna chlorophyll molecule
4)Passage of excited electron to electron-transfer chain
5)Exiton transfer to neighboring chlorophyll

Quizplus · Accepted Answer

The sequence of events in the photochemical reaction centers is as follows:
1) Light excites the antenna chlorophyll molecule (step 3).
2) The exciton is transferred to a neighboring chlorophyll molecule (step 5).
3) The energy reaches the reaction center, and the chlorophyll a molecule is excited (step 1).
4) The excited electron is replaced by one from a neighboring chlorophyll molecule (step 2).
5) The excited electron is passed on to the electron-transfer chain (step 4). 
Therefore, the correct sequence is 3-5-1-4-2, or choice C.

In What Order Do the Following Five Steps Occur in the Photochemical