Which option correctly lists four common types of lipids?

Which option correctly lists four common types of lipids?

• A. Triglycerides, Phospholipids, Steroids, Waxes
• B. Triglycerides, Phospholipids, Proteins, Carbohydrates
• C. Glucose, Fructose, Sucrose, Lactose
• D. Cholesterol, Glycerol, Fatty acids, Phospholipids

Answer: (A)

Lipids come in a few major families with different structures and roles. The four common types listed are triglycerides, phospholipids, steroids, and waxes. Triglycerides store energy in the body; phospholipids form cell membranes with a hydrophilic head and hydrophobic tails; steroids, including cholesterol and various hormones, have a four-ring structure that supports signaling and membrane properties; waxes are long-chain fatty acids linked to long-chain alcohols and provide protective, water-repellent coatings. The other options mix nonlipid molecules (proteins, carbohydrates, sugars) or list building blocks (glycerol and fatty acids) rather than distinct lipid classes, so they don’t represent four standard lipid types.

Lipids come in a few major families with different structures and roles. The four common types listed are triglycerides, phospholipids, steroids, and waxes. Triglycerides store energy in the body; phospholipids form cell membranes with a hydrophilic head and hydrophobic tails; steroids, including cholesterol and various hormones, have a four-ring structure that supports signaling and membrane properties; waxes are long-chain fatty acids linked to long-chain alcohols and provide protective, water-repellent coatings. The other options mix nonlipid molecules (proteins, carbohydrates, sugars) or list building blocks (glycerol and fatty acids) rather than distinct lipid classes, so they don’t represent four standard lipid types.