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Question

In β-pleated secondary protein structure there are

A
Two or more polypeptide chains
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B
Hydrogen bonds between adjacent polypeptide chains
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C
Parallel or antiparallel polypeptides
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D
All the above
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Solution

The correct option is C All the above
Protein is formed by the amino acids which are linked together by peptide bonds.
β-pleated secondary protein structure is formed by the parallel or anti-parallel polypeptide chain linked together by H - bonds. It is stabilized by the hydrogen bonds formed between NH and Co of the adjacent polypeptide chain. The distance between the adjacent amino acids are 3.5 Ao.
So, the correct answer is option D.

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