$A$ decapeptide (Mol. Wt. $796$) on complete hydrolysis gives glycine (Mol. Wt. $75$),alanine,and phenylalanine. Glycine contributes $47.0 \%$ to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is

Optical activity is shown by

Which of the following matches is wrong?

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

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 ultimate products of the oxidation of most of the hydrogen and carbon in foodstuffs are: