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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.
It is Peptide bond. Peptide bond is a type of covalent bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid molecule.plit and merge into it. Answer by Answers Publisher. Confidence votes 260K. The type of molecule that a protein is is a polymer. To be more specific, protein is a polypeptide. Polymers are molecules that consist of repeating subunits. For example, a chain is a polymer of links, and can be considered a poly-link.