What are the four main groups of lipids?

The correct grouping of the four main types of lipids includes fats, phospholipids, steroids, and waxes. Each of these classes of lipids has distinct structures and functions essential for biological processes.

Fats, which include triglycerides, are composed of glycerol and fatty acids and serve as a primary energy storage form in organisms. They also provide insulation and protection to vital organs.

Phospholipids are crucial components of cellular membranes. They possess a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails," allowing them to form bilayers that make up cell membranes, creating boundaries that separate the interior of cells from the external environment.

Steroids, which include hormones like testosterone and estrogen, have a characteristic structure featuring a four-ring carbon skeleton. They play vital roles in signaling and regulating various physiological processes.

Waxes are long-chain fatty acids that are esterified to long-chain alcohols. They provide protective coatings in plants (such as cutin) and are involved in waterproofing and preventing water loss.

In contrast, the other answer choices contain components that are not primarily classified as lipids or include types like proteins and carbohydrates, which belong to different macromolecule