Which of the following proteins is insoluble?

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(C) Proteins are classified into fibrous and globular proteins based on their shape and solubility.Fibrous proteins,such as $Keratin$ and $Collagen$,a

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Keratin

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(C) Proteins are classified into fibrous and globular proteins based on their shape and solubility.Fibrous proteins,such as $Keratin$ and $Collagen$,are generally insoluble in water due to their long,thread-like structure and extensive intermolecular hydrogen bonding.$Keratin$ is a structural protein found in hair,nails,and skin,which is highly insoluble.$Collagen$ is also a structural protein found in connective tissues,which is insoluble.$Casein$ is a globular protein found in milk,which is generally soluble or forms stable colloidal suspensions.$Creatine$ is not a protein; it is a nitrogenous organic acid.Among the given options,$Keratin$ is a classic example of a highly insoluble fibrous protein.

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