Question

When collagen is boiled with water, it forms
A. Precipitate
B. Solution
C. Gelatin
D. Complex collagen

Answer 1

Hint: Collagen act as a glue which holds the body part together by connecting the ligaments and tendon to the protein present in the body. Collagen is insoluble in water.

Complete step by step solution:
Collagen is a protein in the body which occupies one-third of the total protein content of the body. It is present in tendons, ligaments, the connective tissue of skin dermis, cartilage, and dentin which are formed of inelastic fibres with high tensile strength. Natural collagen formed by the body is known as endogenous collagen.
The collagen protein is formed of a triple helix and has a mesh-like dermis network. A triple helix is formed of two identical chains and a third chain. In collagen total of three amino acids are presently named as glycine, proline and hydroxyproline.
Procollagen is the precursor of collagen found in the body that is made by mixing the two amino acids glycine and proline.
In collagen, the glycine content is generally high and is the only protein that has a significant quantity of hydroxyproline. Collagen is generally insoluble in water. When it is added to boiling water, it is changed to gelatin.

Therefore, the correct option is C.

Note: There are several factors which affect collagen formation. On exposure to the sun, collagen formation is slowed down, and consumption of smoke and tobacco affects the formation of collagen. This results in wrinkles, and slow healing of wounds.