Cell membrane
Arthropod have exoskeleton. The exoskeleton is composed of a thin, outer protein layer, the epicuticle, and a thick, inner, chitin–protein layer.
The epidermis produces a protein called keratin. You nails and hair are made of the same protein.
Hair is primarily made of a protein called keratin. Keratin is a tough, fibrous protein that provides structure and strength to hair, as well as to nails and the outer layer of skin.
they are modifications of the epidermis layer, which is avascular, pretty much meaning yes it is dead
Phospholipid bilayer
A double layer of phospholipids
Hair is made of a protein called keratin, which is also found in nails and the outer layer of skin.
Toenails are made of a protein called keratin, the same protein that makes up hair and the outer layer of skin. Keratin provides strength and protection to the toenails.
The tough and protective layer of skin that is made with protein fibers is called the dermis. It lies beneath the epidermis and is composed of collagen and elastin fibers that give it strength and elasticity.
No, the outer covering of viruses is not made of chitin. Viruses have a protein coat called a capsid that surrounds their genetic material. Chitin is a structural polysaccharide found in the exoskeletons of insects and crustaceans.
It is the cell menbrane
virus consist of two layers: 1. its inner layer is made up of DNA. 2. whereas its outer layer or covering is made up of PROTEIN.......and such virus is known as BACTERIOPHAGE VIRUS