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B
Collagen
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C
Keratin
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D
All of the above
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Solution
The correct option is D All of the above Structural proteins are fibrous proteins and form the largest class of proteins measured in terms of their total mass. Structural proteins include myosin, collagen, and keratin.
Keratins form the protective covering like skin, hair, fur, wool, etc. in all land vertebrates. Equally widespread are the actin and myosin proteins of muscle tissue that play a major role in body movements. In addition, there are the collagens of tendons and hides, which form connective ligaments within the body. Thus, the correct answer is option (D), 'All of the above'.