Chapter 11- Lipids

Question 1

Lipid definition

Answer 1

Water insoluble molecules that are highly soluble in organic solvents

• widely used to store energy
• key components of membranes
• do not form polymers
• non covalent assemblies

Question 2

The 5 classes of lipids

Answer 2

1. Free fatty acids: simplest commonly used as fuel; hydrocarbons which terminate with carboxylic acid groups
2. Triacylglycerols: storage form
3. Phospholipids: macromolecule with a polar head and nonpolar tail
4. Glycolipids: bound to carbohydrates important to membranes
5. Steroids: polycyclic hydrocarbons functioning as hormones. Common: cholesterol

Question 3

Membrane lipids moiety

Answer 3

Membrane lipids are amphipathic molecules containing both a hydrophilic and hydrophobic moiety

Question 4

3 common types of membrane lipids

Answer 4

Phospholipids, glycolipids, and cholesterol.