What type of amino acids are leucine,isoleucine,and valine?

The specificity of a protein is due to the .......

Which of the following statement$(s)$ is/are true?
$(i)$ All amino acids contain one chiral centre.
$(ii)$ Some amino acids contain one, while some contain more chiral centres or even no chiral centre.
$(iii)$ All amino acids in proteins have $L$-configuration.
$(iv)$ All amino acids found in proteins have $1^{\circ}$ amino group.

Identify the $X$ figure.

Which of the following are sulfur-containing amino acids?

Which properties do amino acids exhibit in solution by acting as electrolytes through their $-COOH$ and $-NH_2$ groups?