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

How many isoprene units are present in abscisic acid?

The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

During the process of aerobic respiration,acetyl co-enzyme $A$ is formed from which of the following?

The correct match between item $I$ and item $II$ is

Item $I$ (compound)	Item $II$ (reagent)
$(a)$ Lysine	$(p)$ $1$-naphthol
$(b)$ Furfural	$(q)$ Ninhydrin
$(c)$ Benzyl alcohol	$(r)$ $KMnO_4$
$(d)$ Styrene	$(s)$ Ceric ammonium nitrate

Number of compounds from the following which will not produce orange red precipitate with Benedict's solution is $..............$. Glucose,maltose,sucrose,ribose,$2$-deoxyribose,amylose,lactose.