Identify the protein present in nail.

Identify the $N$-terminal and $C$-terminal $\alpha$-amino acids respectively in the following polypeptide fragment: $Ala-Gly-Ser-Tyr-Gly$.

Which of the following statements is not correct?

Which of the following molecules is eliminated during peptide bond formation?

Which of the following describes the linkage of $\alpha-$amino acids in a protein molecule?

Identify the fibrous protein from the following.