blood group A has A antigens on the red blood cells with anti-B antibodies in the plasma. blood group B has B antigens with anti-A antibodies in the plasma. blood group O has no antigens, but both anti-A and anti-B antibodies in the plasma. blood group AB has both A and B antigens, but no antibodies.
Length: 1  A polypeptide is a single linear chain of many amino acids, held together by amide bonds. 2  A protein is one or more polypeptide (more than about 50 amino acids long). 3  An oligopeptide consists of only a few amino acids (between two and twenty).onribosomal peptides are assembled by enzymes that are specific to each peptide, rather than by the ribosome. The most common non-ribosomal peptide is glutathione, which is a component of the antioxidant defenses of most aerobic organisms.
Primary Structure. The primary structure of polypeptides and proteins is the sequence of amino acids in the polypeptide chain with reference to the locations of any disulfide bonds. The primary structure may be thought of as a complete description of all of the covalent bonding in a polypeptide chain or protein.