In haemoglobin,iron is present in:

Match the following columns:

Column-$I$	Column-$II$
$P$. Gluconeogenesis	$I$. Conversion of glucose to glycogen
$Q$. Glycogenesis	$II$. Conversion of glycogen to glucose
$R$. Glycogenolysis	$III$. Formation of glucose from non-carbohydrate sources

The figure given below shows three velocity-substrate concentration curves for an enzyme reaction. What do the curves $a, b$ and $c$ depict respectively?

Find out a qualitative test for proteins,fats and oils,amino acids and test any fruit juice,saliva,sweat and urine for them.

Identify the incorrect pair:

Which type of bond is present between water molecules?