Proteins are polymers of $\alpha$-amino acids,which are linked by peptide bonds. Chemically,proteins are:

The number of tripeptides formed by $3$ different amino acids using each amino acid once is.................

What happens to the biological activity of a protein due to denaturation?

The $pK_a$ values for the three ionizable groups $X, Y$ and $Z$ of glutamic acid are $4.3, 9.7$ and $2.2$ respectively. The structure is $HO_2C-CH_2-CH_2-CH(NH_3^+)-CO_2H$. The isoelectric point $(pI)$ for this amino acid is:

Write a general introduction and the importance of proteins.

Read the following statements carefully:
$(A)$ Albumin is a simple protein.
$(B)$ The amino acid alanine contains an acidic side chain.
$(C)$ Insulin is a hormone.
$(D)$ Muscles contain the protein keratin.
Point out the wrong statements in the above set of statements.