Hormones thyroxin,adrenaline and the pigment melanin are formed from

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.

Which of the following compounds shows aromatic properties?

Simple proteins bonded with a non-proteinic prosthetic group (acting as cofactor) are called:

Which of the following are basic amino acids?

Which of the following proteins is insoluble in any solvent?