What molecules are the building blocks of triglycerides and phospholipids?

Triglycerides and phospholipids are both types of lipids, and their structures are primarily composed of fatty acids and glycerol.

Triglycerides consist of three fatty acids attached to a glycerol backbone. This configuration allows triglycerides to store energy efficiently in the form of fat, which can be utilized by the body when needed.

Phospholipids, which are integral to cell membranes, also contain fatty acids and glycerol. However, instead of three fatty acids, a phospholipid is characterized by two fatty acids and a phosphate group attached to the glycerol. This unique structure imparts amphipathic properties to phospholipids, enabling them to form bilayers that are crucial for cell membrane integrity.

The other options do not serve as building blocks for these lipid types. Sugars and starch refer to carbohydrates, which are not relevant for lipid structures. Monosaccharides and amino acids pertain to carbohydrates and proteins, respectively, none of which contribute directly to the formation of triglycerides or phospholipids. Lastly, nucleotides and enzymes involve nucleic acids and catalytic proteins, which are distinct from the lipid molecules in question. Thus, the correct building blocks for both triglycerides and phosphol