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1 contribute to the mechanical structure of animals, including humans, e.g. keratin in hair and fingernails, and fibrous proteins such as collagen in tendons. 2  enable animals to move, e.g. myosin in muscle.  facilitate transport of smaller molecules around animals' bodies, e.g. haemoglobin.
I need to determine the role of each type in determining protein structure. I need three types of chemical bonds/interactions found in proteins. Covalent bonds (exclude disulfide bonds) form primary structure - backbone and residues. Hydrogen bonds inside of protein - secondary structure.