<prompt> D- form of amino acid is derived from?Produced in liverBreak down from muscleFrom external sourceSynthesis in muscle  <response>: The amino acids which we can be synthesized in our body are always in L-form. So, the source of D amino acids is always exogenous either from diet or from intestinal bacterias. In body all L- amino acids are present and none of D-amino acids except D-serine and D-aspaate in Brain 