The statement 'messenger RNA is single-stranded, and serves as a copy of the DNA code for the ribosome' is correct. This molecule (mRNA) allows the flow of information from DNA to protein.
During gene transcription, a fragment of DNA called gene is used as a template to synthesize a complementary single-stranded RNA called messenger RNA (mRNA).
Subsequently, the mRNA travels to the ribosome where this molecule is used as a template to create a protein by a process called translation.
The linear order of triplet of nucleotide or codons in mRNA indicates the order of amino acids in the growing polypeptide chain.
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