Identify the source of linen from the following:

$A$ 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

How many isoprene units are present in abscisic acid?

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.

Identify the correct set of stereochemical relationships amongst the following monosaccharides $(I)-(IV)$:

During the process of aerobic respiration, $Acetyl \ Co-enzyme \ A$ is formed from which of the following?