Question

multiple choice question
what is the tough protein of skin that few pathogens can penetrate?
o melanin
o collagen
o carotene
o keratin

Explanation:

Melanin is a pigment that gives color to skin, hair, and eyes. Collagen is a protein that provides strength and elasticity to the skin. Carotene is a pigment that gives a yellow - orange color to the skin. Keratin is a tough protein that forms the outer layer of the skin (epidermis) and is difficult for pathogens to penetrate.

Answer:

Keratin