Between which groups is a dipeptide bond formed?

Which of the following are sulfur-containing amino acids?

In the given figure,what does the part labeled $M$ indicate?

$A$ dipeptide is ......

Which one of the following is not a fibrillar protein?

$A$: The polypeptide coil of collagen helix is strengthened by the establishment of hydrogen bonds between the $>NH$ group of the glycine residue of each strand and the $-CO$ group of the other two strands.
$R$: In the collagen helix,a locking effect also occurs with the help of proline and hydroxyproline amino acids.