The secondary structure of protein is stabilised by:

  • A
    Peptide bond
  • B
    Glycosidic bond
  • C
    Hydrogen bonding
  • D
    van der Waals forces

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$A$ tetrapeptide has a $-COOH$ group on alanine. This produces glycine $(Gly)$,valine $(Val)$,phenylalanine $(Phe)$,and alanine $(Ala)$ on complete hydrolysis. For this tetrapeptide,the number of possible sequences (primary structures) with the $-NH_2$ group attached to a chiral center is:

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The total number of basic groups in the following form of lysine is:

The correct structure of the dipeptide gly-ala is

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