Myoglobin stores oxygen in muscles so that during exercise a ready supply of oxygen is available in the muscle tissue. Hormones serve as chemical messengers, carrying signals from one part of the body to another. Some proteins mediate the interpretation of cellular signals, like hormones. Catalysis - Enzymes Enzymes catalyze the chemical reactions that allow cells to function. Fibrous proteins are not water-soluble.
Globular proteins are compact, vaguely spherical-shaped proteins.
All the non-structural types of proteins are globular proteins. Alpha helix and beta sheet are examples. This is the same as hydrolyzing simple amides, except that when dealing with proteins, the molecules carry a lot more baggage. In the lab hydrolysis requires high temperatures and either strong acid or strong base. Denaturation of proteins does NOT affect the primary structure - it does NOT involve hydrolysis of peptide bonds.