Where does a tRNA with the correct complementary anti-codon bind?

The tRNA with the correct complementary anti-codon binds to the first codon in the mRNA sequence because this is where translation initiates. During protein synthesis, the ribosome scans the mRNA for the start codon, usually AUG, which is the codon that signals the beginning of the translation process. The corresponding tRNA, carrying the amino acid methionine, has an anticodon that matches this start codon. This interaction ensures that the correct amino acid is incorporated at the beginning of the growing polypeptide chain.

The other options focus on regions unrelated to the immediate function of tRNA during translation. The end of a protein chain refers to the termination stage of translation, where a fully synthesized protein is released. The ribosomal RNA region is part of the ribosome structure, where the tRNA works, but it is not the specific binding site for the tRNA anticodon. The promoter region of DNA plays a critical role in transcription initiation, but it is not relevant to the binding of tRNA in translation. Therefore, the answer is clearly aligned with the process of translation and the specific action of tRNA during this stage.