Question

The building block of proteins are:

• A. $\alpha$-hydroxy acid
• B. $\alpha$-amino acid
• C. $\beta$- hydroxy acid
• D. $\beta$- amino acid

Answer 1

Answer: (B)

$\alpha$-amino acid

The building block of proteins are $\alpha -$amino acids.
On hydrolysis, proteins gives $\alpha -$amino acids.
$\alpha -$amino acids have structure $H_{2}N-\underset{\underset{\text{R}}{|}}{CH}-COOH$
Proteins $\stackrel{H_{2}O}{\to }n{H}_{2}N-\underset{\underset{\text{R}}{|}}{CH}-COOH$
Proteins are polypeptides and contain peptide linkage ($-\underset{\underset{\text{O}}{||}}{C}-NH-$ linkage)