Question

The most abundant protein in the animal world is
A. Trypsin
B. Hemoglobin
C. Collagen
D. Insulin

Answer 1

Proteins are large macromolecules which perform a variety of functions in the living organisms. They are made up of one or more long chains of amino acid residues and the arrangement and sequences of the protein determine the functionality of the protein in the living organism.

Complete answer:
Proteins are made up of amino acid residues and are important to the living organisms as they perform a wide variety of functions such as catalyzation of metabolic actions, involving in the structural and functional activities of the cell, DNA replication etc. Many proteins are involved as enzymes and hormones.
Collagen is found as the most abundant protein in the animal world. It is the main structural protein in the extracellular matrix and is found in the different connective tissues of the body. It consists of amino acids that are bound together with the help of elongated fibril to form the triple helix. The triple helix is known as collagen helix. It is commonly found in the cartilage, bones, tendons, ligaments as well as the skin.
Trypsin is an enzyme found in the animals and is produced by the pancreas. It is produced in an inactive form known as the trypsinogen. The enzyme trypsin functions to cause hydrolysis of proteins and so, it is also known as a proteolytic enzyme.
Hemoglobin is the iron rich metalloprotein that are found in the red blood cells of the vertebrates. In the vertebrates, the molecule of hemoglobin is formed through the assembly of the four globular protein subunits. It is associated with the function of carrying and transportation of the oxygen and carbon dioxide. It transports oxygen from the lungs or the gills to the other parts of the body and also carries carbon dioxide away from the tissues to the lungs.
Insulin is a peptide hormone and is produced by the beta cells of the islet of Langerhans of the pancreas. It functions by regulating the metabolism of carbohydrates, fats and proteins and causes promotion of absorption of glucose into the muscle cells, liver and fats.

Hence, the correct answer is option (C).

Note: The protein molecules form an integral part of the living organism as they act as enzymes, hormones and other biological materials that are needed by the organism. The collagen is the most abundant protein that is found in the animal world. It forms an important part of the connective tissues of the animals.