Cell Membrane/ Electron Transport Chain / Biochemical Pathway

Cell membrane structure is extremely important for cell life. The cell membrane is shaped to have a phosphate head on the outermost surface and two fatty acid tails are suspended thereon. The membrane is dual, so at the top of the fatty acid tail there are two fatty acid tails attached to the other phosphate head. This is what it looks like: The reason for the shape of the cell membrane is mainly to control the flow of water into and out of the cell. Water is very important for the cell: if there are too much water entering the cell, the cell will explode and if the water is too much the cell will die and die.

It is the last enzyme in the respiratory electron transfer chain of cells located in the membrane. It receives electrons from each of the four cytochrome c molecules and moves them to molecular oxygen molecules that convert molecular oxygen to two molecules of water. In this process, the four protons of the inner aqueous phase are combined to form two water molecules, and the other four protons are moved across the membrane to increase the intermembrane difference of the proton electrochemical potential.

The electron transfer pathway of bacteria is usually inductive. Depending on their environment, bacteria can synthesize different transmembrane complexes and generate different electron transport chains in their cell membranes. Bacteria select their electron transfer chains from DNA libraries containing various potential dehydrogenases, terminal oxidases and terminal reductases. This is usually summarized by saying that the electron transport chain in the bacteria is branched, modular and inductive.

The reaction of the electron transport chain takes place via a series of membrane proteins and organic molecules. They are arranged in four complexes. In eukaryotes, the electron transfer chain is located on the inner membrane of mitochondria. In prokaryotes, it is located on the plasma membrane. Electrons move from higher energy states to lower energy states via electron transport chains. Due to the release of energy, the protons migrate through the channels of the membrane proteins and move them into the intima space. This leads to the accumulation of positively charged protons that generate potentials on the membrane.