In a triglyceride,how are the alcohol (glycerol) and fatty acids linked?

Palmitic acid has .......... carbons.

Following are the statements with reference to 'lipids'.
$(a)$ Lipids having only single bonds are called unsaturated fatty acids.
$(b)$ Lecithin is a phospholipid.
$(c)$ Trihydroxy propane is glycerol.
$(d)$ Palmitic acid has $20$ carbon atoms including carboxyl carbon.
$(e)$ Arachidonic acid has $16$ carbon atoms.
Choose the correct answer from the options given below.

Steroids are derived from:

Waxes do not contain glycerol in their structure,but instead contain which type of alcohol?

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