Which of the following biomolecules contains a non-transition metal ion?

Which of the following represents a nucleoside?

Which biological molecule in living organisms contains $Mg$ as an essential component?

Which class of terpenes includes $\beta$-carotene?

Identify the correct statements from the following:
$I)$ When $DNA$ is hydrolysed,adenine and thymine are obtained in equal quantities.
$II)$ When $RNA$ is hydrolysed,adenine and uracil are obtained in equal quantities.
$III)$ Amylose is a branched polymer with $\alpha-1 \rightarrow 4$ and $\alpha-1 \rightarrow 6$ glycosidic linkages.
$IV)$ Addison disease is due to the abnormal functioning of adrenal cortex.

The number of chiral centres in penicillin is