In which of the following amino acids is the $-OH$ group present?

$(A)$ Lysine	$(B)$ Serine
$(C)$ Tyrosine	$(D)$ Valine

Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form is subjected to a physical change like a change in temperature or a chemical change like a change in $pH$,denaturation of proteins takes place. Explain the cause.

Give the classification of amino acids based on their acidic,basic,or neutral nature.

Which of the following are sulphur-containing amino acids?

$(A)$. Serine	$(B)$. Cysteine
$(C)$. Lysine	$(D)$. Methionine

Identify the acidic amino acid from the following (represented by using three-letter symbols).

Which of the following compounds will form a zwitterion?