Final answer:
The initiation step of translation involves the binding of an initiator tRNA to the start codon.
Step-by-step explanation:
The step of translation that involves the binding of an initiator tRNA to the start codon is the initiation step. During initiation, the small ribosomal subunit binds to the start codon on the mRNA, and an initiator tRNA carrying the amino acid methionine binds to the start codon. This marks the beginning of translation.
Learn more about Translation in biology