What is lecithin?

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

Wool-wax contains:

$S$ - Statement: Lipids that contain non-lipid components in addition to alcohol and fatty acids in their structure are called complex lipids.
$R$ - Reason: Lipoproteins contain protein as a non-lipid component in their structure.

Which alcohol is present in the composition of wax?

Lipids are insoluble in water because lipid molecules are: