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BIO NMDCAT Ribonucleic acid (RNA)
nmdcat.online July 3, 2026

82. The molecular weight of a typical messenger RNA molecule varies considerably because

A. It contains irregular concentrations of modified bases
B. It is transcribed from structural genes of vastly different lengths
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C. It undergoes non-specific enzymatic cleavage in the cytoplasm
D. It binds to unpredictable numbers of structural ribosomal proteins

📝 Explanation

The size and weight of an mRNA molecule depend entirely on the length of the specific polypeptide chain it is meant to code for.

📖 Additional Information

  • It contains irregular concentrations of modified bases
  • It is transcribed from structural genes of vastly different lengths
  • It undergoes non-specific enzymatic cleavage in the cytoplasm
  • It binds to unpredictable numbers of structural ribosomal proteins

The size and weight of an mRNA molecule depend entirely on the length of the specific polypeptide chain it is meant to code for.

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