What is the name of the structural protein present in the horn of a rhinoceros and in human hair?
Keratin
Keratin is a tough, fibrous structural protein rich in the sulphur-containing amino acid cysteine.
It forms human hair, nails and the outer layer of skin, and in animals it makes up horns, hooves, feathers and claws.
A rhinoceros horn is made entirely of compacted keratin fibres, not bone, while melanin is a pigment and amino acids are only the building blocks of proteins.
Hence, Keratin.
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III. Pasta
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Which one of the following options represents the pl of lysine?
How many hydrogen bonds involving the backbone CO and NH can be observed in an α‐helix consisting of 15 amino acid residues?
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