Question

The protein found in yellow fibres

• A. collagen
• B. keratin
• C. elastin
• D. tubulin

Answer 1

The correct option is C elastin

Elastic cartilage is referred to as yellow fibrocartilage. The protein found in yellow fibres is elastin which is found in the extracellular matrix of the connective tissue. Elastin provides both strength and elasticity to certain parts of the body, such as the ears. In elastic cartilage, chondrocytes are organised into elastic fibers, which make up a threadlike network or matrix.

Collagen is the structural protein secreted by the cells of the connective tissue cells. It is a type of protein fibre present throughout the body. It provides strength and cushioning to various tissues. It is mainly found in connective tissue such as cartilage, tendons, ligaments and bones.

Keratin is one of the fibrous structural proteins. It is the major structural component of hair, nails, claws, hooves, and outer layer of skin in vertebrates. Epithelial cells are also protected from stress or damage by keratin.

Tubulin is a type of protein which forms the major component of the eukaryotic cytoskeleton. It is cylindrical in nature.