The phytyl and isoprenoid chain have been removed for visualization. Which process is most directly driven by light energy? The basic function of the light reactions of photosynthesis is the conversion of solar energy to chemical energy. Select the most accurate statement describing the basic function of the light reactions of photosynthesis. Photosystem II is a multisubunit enzyme embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria.

They result in reduced absorbance of light energy and, thus, reduced photosynthetic capacity. Avoidance of overreduction of the electron transport chain along with avoidance of adverse side reactions is an advantage of reduced energy use. Chlorophyll is a pigment found in the thylakoid membranes of the chloroplasts in the leaves. The simple answer is that plants are green because they have green chloroplasts .

That energy is transmitted to the PSI reaction center. Here, P represents the charge-separating chlorophyll pigments (the “primary electron donor”) and A represents the first “stable” acceptor. Energy transfer from the antenna pigments leads to photoexcitation of P on the fs-ps time scale . Charge separation produces oxidized P+ and A– on the ps-ns scale . The recombination of P+A– to produce PA, heat, and potentially damaging chemical species is efficiently prevented by further forward electron transfer that is now proton coupled. These more complex chemical processes ultimately produce stable photosynthetic products and occur, initially, on the ns and μs time scales .

In particular, it carries out the absorption of light photons and the transfer of electrons (e- in our diagram). Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process. What is the overall purpose of the light reactions in photosynthesis? To convert solar energy into chemical energy that cells can use to do work. Electron acceptors of the electron transport chain.

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of _____. When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____. Referring to the accompanying figure, oxygen would inhibit the CO2 fixation reactions in _____. CAM plants keep stomata closed in the daytime, thus reducing loss of water.

The pseudo-C2symmetric cofactor arrangement and the active pathway of electron transfer are indicated on the right. Charge separation from the RC Chl dimer to the find the area of the largest rectangle that can be inscribed in the ellipse x2 a2 + y2 b2 = 1. BChl monomer to B-Phe occurs in approximately 3 ps down the active L branch. This is followed by charge stabilization with electron transfer to the quinones.