Problem: Describe the four levels of protein structure. Distinguish between the following pairs: pyrimidine and purine, ribose and deoxyribose, the 5' end and 3' end of a nucleotide.

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The four levels of protein structure are:

  • Primary: This structure is simply the amino acid sequence in a polypeptide chain.
  • Secondary: This refers to local folded structures that form within a polypeptide due to interactions between atoms of the polypeptide chain backbone (aside from the r group atoms). The most common types of secondary structures are the α helix and the β pleated sheet.
  • Tertiary: It is simply the complete three-dimensional (3-D) structure of a polypeptide.
  • Quarternary: This is the arrangement of more than one protein molecule in a multi-subunit complex. It can also be assemblies of multiple polypeptide chains.
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Problem Details

Describe the four levels of protein structure. 

Distinguish between the following pairs: pyrimidine and purine, ribose and deoxyribose, the 5' end and 3' end of a nucleotide.