Question: For which of the following steps of protein synthesis GTP (Guanosine triosphate) is needed: 
 Options:  <1> Activation of amino acids by aminioacyl-tRNA synthetases. <2> Union of ribosomes to the endoplasmic reticulum. <3> Translocation of nascent tRNA-protein complex from place A to place P. <4> Union of mRNA. <5> Union of signal recognition protein to ribosomes.
3