A simplified model of protein synthesis is shown here: How might this model be revised to show a more accurate depiction of protein
synthesis?
Prior to process 1, DNA should copy itself to allow the cell to divide
After process 2, the completed protein should travel back to the nucleus
Between processes 1 and 2, the mRNA must be modified before leaving the
nucleus
During process 2, the ribosome should remove any mutated nucleotides
from the mRNA

The correct options are:

Prior to process 1, DNA should copy itself to allow the cell to divide.

Between processes 1 and 2, the mRNA must be modified before leaving the  nucleus.

Explanation:

For eukaryotes, the mRNA is made in the nucleus from the DNA. This process in known as transcription. The process of making proteins from the mRNA takes place in the ribososmes of the cytoplasm. This process is known as translation. The mRNA has to be modified before it is transported for translation. Otherwise, the mRNA will be degraded by the enzymes of the nucleus.

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