Q. Which of these does not contain a structural protein?
Answer: C (Ovalbumin).
Explanation: First we should know what are the structural proteins and what are their functions in the body?
The proteins which provide mechanical support to the organs are called structural proteins. They provide strength since they are structurally fibrous, stringy, and insoluble in nature.
Examples of structural proteins
1. Keratin is a fibrous structural protein found in nails, hair, skin, feathers, scales, horns, etc.
2. The protein collagen is the most abundant glue substance in the body that holds the body together and that can be noticed in muscles, skin, tendons, and bones.
3. Elastin is the third type of fibrous protein found in connective tissues of ligaments and tendons and that offers structural stability in the body.
Overall, from the given options, tendons, muscles, and ligaments are found to contain structural proteins. But, ovalbumin is a glycoprotein found in egg white and that can function as a storage protein.