In fact, cysteines are the only amino acids capable of forming covalent bonds, which they do with their particular side chains. Because of side chain interactions, the sequence and location of amino acids in a particular protein guides where the bends and folds occur in that protein (Figure 1).
gas exchange between the pulmonary blood and lungs where oxygen from fresh air in lungs moves into the blood and excess CO2 from the blood moves into the lungs.xygen and carbon dioxide that are transported to and from the lungs and tissue cells where oxygen is pumped throughout the body is CO2 is pumped back into the lungs.
There are 4 processes that occur to make this happen: 1  Pulmonary ventilation, or the movement of air into and out of the lungs; 2  Pulmonary diffusion, or the exchange of O2 and CO2 between the lungs and the blood; 3  Transport of O2 and CO2 in the blood;