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Questions  >>  CBSE XII  >>  Chemistry  >>  Biomolecules
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What are Proteins . Give the structures of Proteins.

$\begin{array}{1 1} \text{(a) Primary structure , Secondary structure , Tertiary structure} \\ \text{(b)water-soluble and fat-soluble.} \\ \text{(c) Helical structure , DNA structure} \\ \text{(d) None of the above}\end{array} $

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A)

Proteins They are linear polymers  of a-amino acids.

Structure of Proteins

 (a) Primary structure:  It simply reveals the sequence of amino acids.(fatty acids , starch)

 (b) Secondary structure:  α-helix structure maintained by hydrogen bonds  or β-pleated sheet structure when R is small group.

(c) Tertiary structure:  The folding and superimposition of polypeptide  chains forms a compact globular shape, termed as tertiary structure. It is stabilised by covalent, ionic, hydrogen and disulphide bonds. The precise arrangement constitutes the quaternary structure.

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