Biomass is carbon based and it is composed of mixtures of organic molecules containing hydrogen, normally it would include atoms of oxygen, often nitrogen and also small amounts of other atoms like such, including alkali, alkaline earth and heavy metals. Those metals are usually found in functional molecules such as the porphyrins which would include chlorophyll which also contains magnesium.
<span>Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot</span>
B cells are a type of lymphocytes and it is responsible for the immune system. B cells help to protect body by producing specific antibodies to fight against each antigen which are strangers to the body specially for viral infections.
