The primary precursor for the production of cholesterol in our body is

The energy available for the work of a biological system is known as.....

Select an appropriate chemical bond among ester bond,glycosidic bond,peptide bond and hydrogen bond and write against each of the following:
$(a)$ Polysaccharide
$(b)$ Protein
$(c)$ Fat
$(d)$ Water

What is the cause of the variations found in different species of living organisms?

Which of the following is not a member of the $Vitamin$ $B$ complex group?

Match the following columns:

Column-$I$	Column-$II$
$(A)$ Disaccharide	$(i)$ Unsaturated fatty acid
$(B)$ Galactose	$(ii)$ Saturated fatty acid
$(C)$ Oleic acid	$(iii)$ Monosaccharide
$(D)$ Stearic acid	$(iv)$ Monosaccharide pair