Proteins are both composed and comprised of amino acids.
Yes, a substance can have fat and protein. Milk has fat and protein.
keratin
protein
Fibrous!
Keratin is a nonliving protein substance found in hair, nails, and the outer layer of skin. It provides structure and strength to these tissues.
yolk
keratin
Amino acids
Urea is the substance derived from protein metabolism that is removed from the blood in the kidneys and excreted in urine.
The protein rate is a measurement of the amount of protein in a substance, usually expressed as a percentage or grams per serving.
Gelatin is a protein made from animal products. It is a mixture not a pure substance
Yes, an enzyme is an organic substance, because it is a protein, and all proteins contain carbon, which is the definition of an organic substance.