The most abundant protein in the whole biosphere is:

Which of the following is the correct structure of the amino acid cysteine?

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.

How many amino acids are present in the structure of insulin?

What are lysine and tryptophan?

Alanine and Phenylalanine are which type of amino acids?