Question

what is the function of the protein keratin?
o to provide support and structure for cells in hair, skin, and nails
o to fight infections caused by bacteria and viruses
o to increase chemical reaction rates in the digestive system
o to transmit chemical signals throughout the body

Explanation:

Keratin is a fibrous structural protein. It is a key component in hair, skin, and nails. Its main role is to offer support and structure to these parts. Antibodies (not keratin) fight infections. Enzymes (not keratin) increase chemical reaction rates. Hormones (not keratin) transmit chemical signals.

Answer:

to provide support and structure for cells in hair, skin, and nails