Lipids CH 2.4

Question 1

Lipid Characteristics

Answer 1

Fats
Hydrocarbons
Hydrophobic (H2O insoluble)
Many nonpolar covalent bonds
DO NOT contain monomers (not polymers)

Question 2

Roles of Lipids

Answer 2

1. Store energy in C-C and C-H bonds
2. Structure of cell membranes and on body surfaces
3. Fat serves as thermal insulation

Question 3

Most common lipid?

Answer 3

Triglyceride

Question 4

Components of triglycerides?

Answer 4

3 Fatty Acids + 1 glycerol molecule

Question 5

Saturated Fatty Acids

Answer 5

All single bonds –> ridgid/straight
Solids
High Melting Point

Question 6

Unsaturated Fatty Acids

Answer 6

1 or more double bonds
Prevents from packing together
Liquids
Low Melting Point

Question 7

Lipids vs Carbohydrates, which releases more energy?

Answer 7

Lipids (2x as much as degraded carbohydrates)

Question 8

Amphipathic

Answer 8

2 opposing chemical properites

1 polar end and 1 nonpolar end

Question 9

Tryglycerides, hydrophobic or phillic?

Answer 9

Hydrophobic

Question 10

Phospholipids

Answer 10

Amphipathic
Form bilayer for cell membranes
2 Fatty Acids + Phosphate group attached to a glycerol

Question 11

Fats

Answer 11

Triglycerides that are solid at room temperature

Contain longer, saturated fatty acid chains

Question 12

Oils

Answer 12

Triglycerides that are liquid at room temperature

Contain shorter, unsaturated chains (double bonds/ kinks)