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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.

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first five
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.
today s announcements
Today’s Announcements

Cell Structure Unit Exam

  • Corrections due no later than, Thursday, February 27

Quiz: Carbohydrates & Lipids

  • Friday, February 28 [Gold 1]
lipids

Lipids

What is Fat?

http://ed.ted.com/lessons/what-is-fat-george-zaidan

Why don't water and oil mix?

http://ed.ted.com/lessons/why-don-t-oil-and-water-mix-john-pollard

what do ear wax hormones cholesterol and whale blubber all have in common
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?

lipids1
Lipids molecules include

triglycerides (fats and oils)

waxes

steroids

Lipids are non-polar

lipids do not dissolve in water

Phospholipids make up all cell membranes.

Lipids
main functions of lipids
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)

main functions of lipids1
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)

triglycerides
Triglycerides
  • Composed of 1 glycerol unit and 3 fatty acids
  • Commonly called “fats” and “oils”
fatty acid structure
Fatty acid structure

Saturated fatty acids

Unsaturated 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
what type of reaction do you think attaches the fatty acids onto glycerol
What type of reaction do you think attaches the fatty acids onto glycerol?

Glycerol + 3 Fatty Acids Triglyceride + 3 Water

triglyceride models
Triglyceride models
  • Follow the instructions on the handout to make models showing 2d- Triglyceride shape
phospholipids
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.

PhosphoLipids

Hydrophilic – “water loving”

Hydrophobic – “water hating"

structure of phospholipids
Structure of phospholipids

Hydrophobic

  • 2 fatty acids+1 phosphate group
  • one end is soluble in water (phosphate group)

Hydrophilic

structure of phospholipids1
Structure of phospholipids
  • Identify the following:
    • Glycerol
    • Saturated fatty acid
    • Unsaturated fatty acid
    • Phosphate group
practice with vocab frayer models
Practice with Vocab: Frayer Models
  • In your notebook, Create a frayer model for the following topics: Lipids, triglycerides, and phospholipids

(Write topic here)

practice
Practice
  • Begin Lipids Practice Problems
  • Complete as homework. Due Thursday.