The bio-molecule inside the photosynthetic reaction center, which enables solar

Question

The bio-molecule inside the photosynthetic reaction center, which enables solar energy conversion, is a packed arrangement of a pair of chlorophyll molecules. It absorbs light at 870 nm.

a) How much energy does this correspond to in kcal/mol. use the formula E = hv

b) DUring this photon absorption, an electron is transferred from the special pair to another single molecule of chlorophyl. Assuming the transformation from light energy to chemical energy is 100% efficient, what is the minimum reduction potential that the acceptor chlorophyll can have in relation to the donor chlorophylL?

c) What residues bind this pair? Can any of those molecule hydrogen bond to the cofactors of the chlorophyll-pair? Specify donor/acceptor groups.

Explanation / Answer

I'm going to be honest, this part is not of my knowledge, but I can help you with part A).

The formula is E = hv but it can be also E = hc/L
h is the planck constant, and c is the speed of light so:

E = 6.63x10-34 * 3x108 / 870x10-9
E = 2.29x10-19 J/mol

To convert it to kcal/mol:
2.29x10-19 * 0.0002388458966275 kcal/J = 5.46x10-23 kcal/mol

Hope this helps

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