The most abundant protein in animals, forming 25%-35% of body protein, is which type of protein?

Explanation

'Simple proteins' are those that are made of amino acid units only, joined by peptide bonds. Upon hydrolysis, they yield a mixture of amino acids and nothing else. 'Conjugated proteins' are composed of simple proteins combined with a non-proteinous substance. The non-proteinous substance is called the 'prosthetic' group or cofactor. 'Derived proteins' are not naturally occurring proteins and are obtained from simple proteins by the action of enzymes and chemical agents. Since both conjugated and derived types arise from simple proteins, the amount of simple proteins in the body has to be the greatest. Moreover, the functionality of simple proteins is so vast that the quantity required for them is large.