Stella described protein synthesis as a process that makes the necessary proteins for the human body to function. She explained the process in the following steps. 1. DNA is transcribed into mRNA. 2. Amino acids form a chain. 3. The amino acid chain is folded into a protein in the endoplasmic reticulum. What step did Stella miss in her explanation?

Stella missed the step of translation, which is the process where the mRNA is translated by ribosomes into a chain of amino acids, ultimately forming a protein.