Identify the sulphur-containing vitamin.

Which substance is most abundant in a cell?

Match List $-I$ with List $-II$ :

List $-I$	List $-II$
$a$. Adenine	$i$. Pigment
$b$. Anthocyanin	$ii$. Polysaccharide
$c$. Chitin	$iii$. Alkaloid
$d$. Codeine	$iv$. Purine

Choose the correct answer from the options given below:

What do "a" and "b" represent in the given structure of the nitrogenous base?

Match the names of items listed under column $I$ with the items given under column $II$; choose the answer which gives the correct combination of the alphabets of the two columns.

Column $-I$	Column $-II$
$(A)$ Ketone	$(p)$ Has $5$ carbon sugar,a phosphate group and a nitrogenous base
$(B)$ Fatty acid	$(q)$ Has long chain of carbon and hydrogen atoms and a carboxyl group at one end
$(C)$ Aldehyde	$(r)$ Has a carbonyl group at the end of the carbon chain
$(D)$ Nucleotide	$(s)$ Has a carbonyl group within the carbon chain

When the body is rapidly oxidizing fat,excessive ketone bodies get accumulated in the body,resulting in the formation of