RNA strand synthesized in the nucleus as a complement to a specific gene and carries the information for the sequence of amino acids to make a specific protein.

• A. Messenger RNA
• B. Transfer RNA
• C. Ribosomal RNA
• D. Micro RNA

Answer: (A)

The main idea here is transcription producing a molecule that carries the protein-coding instructions from DNA to the protein-making machinery. Messenger RNA is made in the nucleus as a complementary copy of a gene’s DNA template and contains codons that specify the order of amino acids in a protein. During translation, ribosomes read this mRNA to assemble the corresponding amino acids with the help of tRNA. The other RNA types have different roles: transfer RNA brings amino acids to the ribosome, ribosomal RNA forms and helps build the ribosome, and microRNA regulates gene expression rather than encoding a protein. So the described RNA strand is messenger RNA.