How many alcohol groups are typically present in the structure of glycerol?

Name the lipid that contains a $-COOH$ group.

$A$: Linolenic acid is an essential fatty acid.
$R$: Linolenic acid cannot be synthesized in human beings.

Why are lipids not considered as macromolecules?

Identify the saturated and unsaturated fatty acids from the following list:
$I-$ Acetic acid,$II-$ Methanoic acid
$III-$ Arachidonic acid,$IV-$ Palmitic acid
$V-$ Stearic acid,$VI-$ Oleic acid
Select the correct grouping for Saturated fatty acids and Unsaturated fatty acids.

The given fatty acid is known as $CH_3(CH_2)_7 CH = CH (CH_2)_7 COOH$.