A) collagen
B) elastin
C) \[\alpha -\]keratins
D) none of these.
Correct Answer: D
Solution :
: Keratin is an extremely tough protein substance in hair, nails and horny tissues. It is insoluble in water, weak acids or alkalis and is unaffected by most proteolytic enzymes. Collagen is a fibrous insoluble protein found in the connective tissue, including skin, bone, ligaments and cartilage. It represents about 30% of the total body protein. Elastin is a protein substance forming the principal constituent of yellow elastic tissue, comprising about 30% of this tissue.
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