This is a two-part process that ends in the assembly of proteins at the ribosomes within cells. The first part

The protein synthesis.

Explanation:

The question is not complete, here is the complete question:

This is a two-part process that ends in the assembly of proteins at the ribosomes within cells. The first part, transcription, begins in the nucleus, when the DNA code is transferred to mRNA. The second part, translation, takes place at the ribosomes, where both mRNA and tRNA work to assemble proteins.

The events in the question are describing protein synthesis.

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