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Standard XII
Biology
Primary Structure of Protein
Question

Recognise the figure and find out the correct matching.

885135_8f37182ac7f84162bff2a3753fdc8301.PNG
  1. A-Primary structure, B-Secondary structure
  2. A-Secondary structure, B-Primary structure
  3. A-Secondary structure, B-Tertiary structure
  4. A-Tertiary structure, B-Quaternary structure

A
A-Tertiary structure, B-Quaternary structure
B
A-Secondary structure, B-Tertiary structure
C
A-Secondary structure, B-Primary structure
D
A-Primary structure, B-Secondary structure
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Solution
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The correct option is C A-Secondary structure, B-Tertiary structure
Proteins are made up of amino acid that is bonded together by the peptide bonds. The primary structure of a protein is the covalent connection of proteins. It is a linear sequence of amino acid bound together with peptide bonds. Only in the secondary structure, there is a complex folding of the linear polypeptide chain into a specific structure which is the Alpha helical structure. When it is repeated, they form a pleated sheet-like structure. This forms the beta pleated sheet. This has hydrogen bonds in addition to the peptide bonds that provide stability to the protein and this is the secondary structure of the protein. When there is more folding of the secondary proteins, they form the tertiary structure. This is the functional structure of proteins.
Thus, the correct answer is 'A-Secondary structure, B-Tertiary structure.'

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