Shira listed the steps for protein production in cells.1. A strand of RNA is made.2. RNA leaves the nucleus.3. RNA moves to the ribosome.4. A protein is made.

To make an RNA strand, the cell transcribes a gene from DNA. The DNA must first unwind, or “unzip,” so the gene can be read and RNA can be built; therefore this happens before step 1, when the RNA strand is made. DNA replication is not a step in this protein-production sequence.

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