During initiation stage of translation mRNA joins with tRNA and two ribosomal subunits.
What is initiation?
The start of transcription is called initiation. It happens when the RNA polymerase enzyme interacts with the promoter, a portion of a gene.
This instructs the DNA to unwind so that the enzyme can "read" the bases in one of the DNA strands. The enzyme is now ready to assemble a complementary base –sequenced mRNA strand.
The small ribosomal subunit attaches to the beginning of the mRNA sequence during initiation. Then the so-called start codon of the mRNA sequence attaches to a transfer RNA (tRNA) molecule carrying the amino acid methionine.
All mRNA molecules have a AUG-coded start codon, which denotes methionine.
Therefore, During initiation stage of translation mRNA joins with tRNA and two ribosomal subunits.
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