Final answer:
The elongation initiation factor that delivers tRNA to the P-site during translation is the eukaryotic initiation factor 2 (eIF2) in its GTP-bound form.
Step-by-step explanation:
The elongation initiation factor that delivers tRNA to the P-site during translation is known as eukaryotic initiation factor 2 (eIF2) when bound to GTP. During the initiation phase of translation, eIF2, in its GTP-bound form, associates with the initiator tRNA and forms a ternary complex. This complex is then recruited to the ribosome, positioned at the P-site with the help of additional initiation factors. Once the large ribosomal subunit joins, the initiation factors are released following the hydrolysis of GTP on eIF2, which facilitates the proper positioning of the initiator tRNA at the P-site, ready for the elongation phase of protein synthesis.