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BIO NMDCAT BIOLOGICAL MOLECULES
nmdcat.online June 27, 2026

The fundamental reason that proteins are the most diverse class of biological molecules in terms of structure and function is that

A. They are the only molecules built from nitrogen-containing monomers
B. They are synthesized directly from the information encoded in DNA
C. Their monomers (20 amino acids) can be arranged in a vast number of sequences with different R-group chemistries
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D. They are synthesized only in the presence of nucleic acids

📝 Explanation

With 20 different amino acids as monomers, the number of possible sequences and lengths for a polypeptide is astronomically large. Furthermore, the diverse chemical properties of the 20 R-groups (charged, polar, non-polar, etc.) enable a protein to fold into an immense variety of complex 3D shapes.

📖 Additional Information

  • They are the only molecules built from nitrogen-containing monomers
  • They are synthesized directly from the information encoded in DNA
  • Their monomers (20 amino acids) can be arranged in a vast number of sequences with different R-group chemistries
  • They are synthesized only in the presence of nucleic acids

With 20 different amino acids as monomers, the number of possible sequences and lengths for a polypeptide is astronomically large. Furthermore, the diverse chemical properties of the 20 R-groups (charged, polar, non-polar, etc.) enable a protein to fold into an immense variety of complex 3D shapes.

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