`=>` Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule.
`=>` Equal number of amino and carboxyl groups makes it neutral; more number of amino than carboxyl groups makes it basic and more carboxyl groups as compared to amino groups makes it acidic.
`=>` The amino acids, which can be synthesised in the body, are known as nonessential amino acids.
`=>` The amino acids, which cannot be synthesised in the body and must be obtained through diet, are known as essential amino acids (marked with asterisk in Table 14.2).
`=>` Amino acids are usually colourless, crystalline solids.
`=>` These are water-soluble, high melting solids and behave like salts rather than simple amines or carboxylic acids.
`=>` This behaviour is due to the presence of both acidic (carboxyl group) and basic (amino group) groups in the same molecule.
`=>` In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as `color{green}("zwitter ion")`. This is neutral but contains both positive and negative charges.
● In zwitter ionic form, amino acids show amphoteric behaviour as they react both with acids and bases.
`=>` Except glycine, all other naturally occurring `color{red}(α)`-amino acids are optically active, since the `color{red}(α)`-carbon atom is asymmetric.
● These exist both in `‘color{red}(D)’` and `color{red}(L)` forms.
`=>` Most naturally occurring amino acids have `color{red}(L)`-configuration.
`=>` `color{red}(L)`-aminoacids are represented by writing the `color{red}(–NH_2)` group on left hand side.
`=>` Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule.
`=>` Equal number of amino and carboxyl groups makes it neutral; more number of amino than carboxyl groups makes it basic and more carboxyl groups as compared to amino groups makes it acidic.
`=>` The amino acids, which can be synthesised in the body, are known as nonessential amino acids.
`=>` The amino acids, which cannot be synthesised in the body and must be obtained through diet, are known as essential amino acids (marked with asterisk in Table 14.2).
`=>` Amino acids are usually colourless, crystalline solids.
`=>` These are water-soluble, high melting solids and behave like salts rather than simple amines or carboxylic acids.
`=>` This behaviour is due to the presence of both acidic (carboxyl group) and basic (amino group) groups in the same molecule.
`=>` In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as `color{green}("zwitter ion")`. This is neutral but contains both positive and negative charges.
● In zwitter ionic form, amino acids show amphoteric behaviour as they react both with acids and bases.
`=>` Except glycine, all other naturally occurring `color{red}(α)`-amino acids are optically active, since the `color{red}(α)`-carbon atom is asymmetric.
● These exist both in `‘color{red}(D)’` and `color{red}(L)` forms.
`=>` Most naturally occurring amino acids have `color{red}(L)`-configuration.
`=>` `color{red}(L)`-aminoacids are represented by writing the `color{red}(–NH_2)` group on left hand side.