1. First five True or false? If false, correct to make true
Monomers are made of many polymers
Hydrolysis reactions produce water
Glycogen is a polysaccharide
Cellulose is the main source of energy for humans
Starch is a disaccharide
Amylose chains in starch have a branched structure.

2. Today’s Announcements
Cell Structure Unit Exam
Corrections due no later than, Thursday, February 27
Quiz: Carbohydrates & Lipids
Friday, February 28 [Gold 1]

3. Why don't water and oil mix?
Lipids
What is Fat?
Why don't water and oil mix?

4. Why do we need fat? What biological purposes do you think it serves?
What do ear wax, hormones, cholesterol, and whale blubber all have in common?
Why do we need fat? What biological purposes do you think it serves?

5. What substances contain lipids?

6. Lipids Lipids molecules include Lipids are non-polar
triglycerides (fats and oils)
waxes
steroids
Lipids are non-polar
lipids do not dissolve in water
Phospholipids make up all cell membranes.

7. Main functions of lipids
1. Long term energy storage
2. Protection against heat loss (insulation)
3. Protection against physical shock
4. Protection against water loss
5. Chemical messengers (hormones)
6. Major component of membranes (phospholipids)

8. Main functions of lipids
1. Long term energy storage
2. Protection against heat loss (insulation)
3. Protection against physical shock
4. Protection against water loss
5. Chemical messengers (hormones)
6. Major component of membranes (phospholipids)

9. Triglycerides
Composed of 1 glycerol unit and 3 fatty acids
Commonly called “fats” and “oils”

10. Fatty acid structure Unsaturated fatty acids Saturated fatty acids
No carbon double bonds
Typically solids at room temperature
More common in animals
Have a double bond somewhere between the carbons
Have less hydrogen than a saturated fatty acid
Melt more easily
Typically liquids at room temperature
More common in plants

11. (A)Saturated or (B)unsaturated?

12. (A)Saturated or (B)unsaturated?

13. Saturated vs. unsaturated: similar but different

14. Saturated vs. unsaturated fats

15. What type of reaction do you think attaches the fatty acids onto glycerol?
Glycerol + 3 Fatty Acids Triglyceride + 3 Water

16. Triglyceride models
Follow the instructions on the handout to make models showing 2d- Triglyceride shape

17. Hydrophilic – “water loving” Hydrophobic – “water hating"
PhosphoLipids
Hydrophilic – “water loving”
Hydrophobic – “water hating"
Phospholipids make up all cell membranes and play a large role in determining what gets in and out of the cell.
Hydrophilic and hydrophobic regions give phospholipids their unique properties.
ISIS/Draw is FREE!

18. Structure of phospholipids
Hydrophobic
2 fatty acids+1 phosphate group
one end is soluble in water (phosphate group)
Hydrophilic

19. Structure of phospholipids
Identify the following:
Glycerol
Saturated fatty acid
Unsaturated fatty acid
Phosphate group

20. Practice with Vocab: Frayer Models
In your notebook, Create a frayer model for the following topics: Lipids, triglycerides, and phospholipids
Definition:
Characteristics:
Drawing of structure:
Example:
(Write topic here)

21. Practice Begin Lipids Practice Problems
Complete as homework. Due Thursday.

22. Exit ticket: How does the structure of a lipid relate to its function
Exit ticket: How does the structure of a lipid relate to its function? Write 2-3 sentences.