Steroids are derived from:

Sterone and sterol are distinguished based on the presence or absence of which group?

$P$: Oleic acid is a long-chain unsaturated fatty acid.
$Q$: In it,two consecutive carbon atoms are joined by a double bond at some positions.

How many molecules of fatty acids combine with one molecule of glycerol to form a lipid molecule?

$A$: Butter is solid at room temperature.
$R$: It contains long-chain saturated fatty acids.

What is the ratio of $H$ to $O$ in the structure of fats?