Which term is a waxy lipid found in animal cells?

Which term is a waxy lipid found in animal cells?

• A. Lipid
• B. Cholesterol
• C. Carbohydrate
• D. Starch

Answer: (B)

Cholesterol is the waxy lipid found in animal cell membranes. It is a specific type of lipids called a sterol, with a four-ring structure that integrates among the phospholipids in the membrane. Its hydroxyl group makes it slightly polar, so it sits in the membrane rather than floating away. This position lets cholesterol regulate membrane fluidity: it keeps the membrane from being too fluid at warm temperatures and prevents it from becoming too rigid at cool temperatures, helping the membrane stay functional across conditions. It’s not a carbohydrate, which are sugars and starches, and it’s not just any lipid; cholesterol is a particular lipid with a unique role in animal cells.

Cholesterol is the waxy lipid found in animal cell membranes. It is a specific type of lipids called a sterol, with a four-ring structure that integrates among the phospholipids in the membrane. Its hydroxyl group makes it slightly polar, so it sits in the membrane rather than floating away. This position lets cholesterol regulate membrane fluidity: it keeps the membrane from being too fluid at warm temperatures and prevents it from becoming too rigid at cool temperatures, helping the membrane stay functional across conditions. It’s not a carbohydrate, which are sugars and starches, and it’s not just any lipid; cholesterol is a particular lipid with a unique role in animal cells.