<prompt> All of the following statements about carbohydrate antigens are true exceptGood memory responsePoor immunogenicityT-cell independent immunityPolyclonal response  <response>: Ans. a Good memory response Ref. Understand the immune system Llge waryBlack well Polysaccharide antigens are ineffective in producing immunogenic memory and this is the reason behind the protein conjugation of polysaccharide vacines. Carbohydrate Polysaccharide antigens: T-cell independent antigens, hence they do not evoke T-cell response which is essential for memory response. Usually present in bacterial cell wall and capsule Stimulates B-cell directly without involving antigen presenting cells, or else produce polyclonal activation of B-cells. Considerably less immunogenic in comparison to peptide antigen Dont exhibit delayed type hypersensitivity In large doses induce tolerance 