What is released during the formation of a peptide bond?

The triple helical structure of collagen was published in Nature in $1954$, and the analysis of the allowed conformations of proteins was performed through the use of the:

The helical structure of protein is stabilized by

The diversity observed in protein molecules is primarily due to the diversity of which of the following?

The most abundant protein in the animal world is

Polypeptide chains present in insulin are linked together by: