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> The lactase mRNA is translated into the protein lactase at the ribosome."
almost, but no cigar.  the mRNA does not BECOME the protein...  it carries the information for a single step in the construction of the protein by the ribosome.  mRNA is a chain of nucleotide bases.  a protein is a chain of amino acids.  each mRNA carries binds one specific amino acid and transfers it to the growing protein chain.