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Questions  

Which of the following statements is incorrect about the secondary structure of protein?

a
It refers to the shape in which long polypeptide chain can exist.
b
It exists in two different type of structures, i.e. α-helix and β-pleated sheet structure
c
Its structure arises due to regular folding of the backbone of the polypeptide chain
d
There is the covalent bonding between and -NH groups of the peptide bond

detailed solution

Correct option is D

The secondary structure of proteins refers to the shape in which a long polypeptide chain can exist. They are found to exist in two different types of structures, i.e, α-helix and β-pleated sheet structure. These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between group of the peptide bond.

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"When the polypeptide chains run parallel are held together by hydrogen and disulphide bonds, then fibre like structure is formed. Such proteins are generally insoluble in water." Name the type of protein which favours the above information.


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