What is correct about amino acid?

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(D) Amino acids are organic compounds containing an amino group $(-NH_2)$ and a carboxyl group $(-COOH)$.$1$. They are amphoteric in nature because th

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All the above

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(D) Amino acids are organic compounds containing an amino group $(-NH_2)$ and a carboxyl group $(-COOH)$.$1$. They are amphoteric in nature because they possess both acidic $(-COOH)$ and basic $(-NH_2)$ groups,allowing them to react with both acids and bases.$2$. At the isoelectric point $(pI)$,the amino acid exists as a zwitterion,where the molecule has a net charge of zero (the $-NH_2$ group is protonated to $-NH_3^+$ and the $-COOH$ group is deprotonated to $-COO^-$).$3$. Amino acids are the fundamental building blocks (monomeric units) of proteins,linked together by peptide bonds.Since all the given statements are correct,the correct option is $D$.

List-$I$	List-$II$
$(1)$ Non-polar $R$ group	$(a)$ Tyrosine
$(2)$ Polar positive $R$ group	$(b)$ Glutamic acid
$(3)$ Polar negative $R$ group	$(c)$ Histidine
$(4)$ Polar uncharged $R$ group	$(d)$ Tryptophan

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Select the correct option for the following matches:
List-$I$ List-$II$
$(1)$ Non-polar $R$ group $(a)$ Tyrosine
$(2)$ Polar positive $R$ group $(b)$ Glutamic acid
$(3)$ Polar negative $R$ group $(c)$ Histidine
$(4)$ Polar uncharged $R$ group $(d)$ Tryptophan

How many types of amino acids are found in the structure of proteins?

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