lipids (chapter 3)

Question 1

what molecules do lipids contain

Answer 1

carbon, hydrogen, oxygen (lipids are macromolecules)
- made of glycerol and fatty acids

Question 2

what are macromolecules

Answer 2

molecules not built from repeating units or monomers like polysaccharides.

Question 3

tryglycerides

Answer 3

• made up 1 glycerol moldecule and 3 fatty acid molecules
• ester bods (very strong)
• they are a long term memory storage
• thermal insulation to provent heat loss
• protects vital organs
• buoyancy for aquatic animals

Question 4

saturated and unsaturated fats

Answer 4

saturated fats have 1 bond and are solid at room temperature

• unsaturated fats have 2 bonds and are liquid st room temperature

Question 5

function of phospholipids

Answer 5

• membrane formation
  -phosphate head and fatty acid tails
  -are found in the cytoplasm of every cell

Question 6

what is cholesterol

Answer 6

• Is a sterol
• promotes strength and fluidity of cell membranes
• manufactures vitamin D, steroid hormones and bile

Question 7

cholesterol and cell membranes

Answer 7

• cholesterol adds stability to cell membranes, in hotter enviroments more cholesterol is needed than in cool enviroments

Question 8

roles of lipids

Answer 8

• membrane and hydrophobic barriers formation
• hormone production
• waterproofing
• buoyancy
• thermal insulation in animlas
• cushioning