<prompt> The antibiotic that inhibits protein synthesis by premature chain termination and which structurally resembles an aminoacyl t-RNA is -TetracyclineChloramphenicolPuromycinErythromycin  <response>: Ans. is c i.e., Puromycin o Puromycin is a tRNA analogue which combines with amino acid in place of tRNA and forms a complex with amino acid that prevents addition of fuher amino acids to polypeptide i.e. causes premature chain termination. 