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.
Each polypeptide chain is comprised of 141 to 146 amino acids each. The sequence and number of amino acids is determined by structural genes. Variations in amino acid sequence give rise to different types of polypeptide chains. Production of heme and globin combine to form hemoglobin molecule.