Beta decay is a consequence of the weak force, which is characterized by relatively lengthy decay times. Nucleons are composed of up or down quarks, and the weak force allows a quark to change type by the exchange of a W boson and the creation of an electron/antineutrino or positron/neutrino pair.
Most procaryotes contain some sort of a polysaccharide layer outside of the cell wall polymer. In a general sense, this layer is called a capsule. A true capsule is a discrete detectable layer of polysaccharides deposited outside the cell wall.
surface. The cell walls of archaea contain polysaccharides and proteins, but lack peptidoglycan. The Gram stain is a valuable tool for identifying specific bacteria based on differences in their cell walls. â Gram-positive bacteria have simple cell walls with large amounts of peptidoglycans.he cell walls of archaea contain polysaccharides and proteins, but lack peptidoglycan. The Gram stain is a valuable tool for identifying specific bacteria based on differences in their cell walls. â Gram-positive bacteria have simple cell walls with large amounts of peptidoglycans.