Practice Questions

Glycerol contains three hydroxyl (-OH) groups.

Hydrophobic tails avoid water and remain inside the membrane.

Neutral fats (triglycerides) have three fatty acids and no phosphate group.

Lipase specifically hydrolyzes ester bonds present in triglycerides.

The phosphate-containing head is polar and interacts with water.

Double bonds introduce bends that reduce tight packing of fatty acid chains.

Mixed triglycerides contain two or three different fatty acids attached to glycerol.

Esterification joins glycerol and fatty acids by removing one molecule of water.

Phospholipids arrange into a bilayer with hydrophilic heads outward and hydrophobic tails inward, forming a selectively permeable membrane.