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

Quizplus · Accepted Answer

The first step is the excitation of the antenna chlorophyll molecules, which is step 3 in the given options. The exciton transfer to neighboring chlorophylls occurs next, which is step 5. Then comes the excitation of the chlorophyll a molecule at the reaction center, which is step 1. The excited electron is passed on to the electron-transfer chain, which is step 4. Finally, the electron in the reaction center chlorophyll is replaced, which is step 2. Therefore, the correct order is 3-5-1-4-2, or option C.

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