Dissimilatory metal reduction microorganisms (DMRM) harvest en er gy by a novel metabolism pathway, coupling anaerobic oxidation of organic substa nces to the reduction of metal oxides.
However, in bacteria the plasma membrane has other important roles such as respiration, photosynthesis, and the synthesis of lipids and cell wall components.
That glucose could also be taken in by the cells so they can do respiration, we can get ATP from it, or we could also store it in glycogen which is mostly going to be found in the liver.
And so not only does a plant do photosynthesis, they then use cellular respiration to actually break the energy and get the energy out of the food that they ended up making.
If it seems like I'm going too fast or it's not understandable, I've made a video on both photosynthesis and respiration individually and so take a look at those.