<prompt> Guanosine triphosphate GTP is required by which of the following steps in protein synthesis?Aminoacyl-tRNA synthetase activation of amino acidsAttachment of ribosomes to endoplasmic reticulumTranslocation of tRNA-nascent protein complex from A to P sitesAttachment of mRNA to ribosomes  <response>: . Translocation of tRNA-nascent protein complex from A to P sites. Two molecules of GTP are used in the formation of each peptide bond on the ribosome. In the elongation cycle, binding of aminoacyl-tRNA delivered by EF-Tu to the A site requires hydrolysis of one GTE Peptide bond formation then occurs. Translocation of the nascent peptide chain on tRNA to the P site requires hydrolysis of a second GTE The activation of amino acids with aminoacyl-tRNA synthetase requires hydrolysis of ATP to AMP plus PPi. 