3.1.3- Lipids

Question 1

Lipids

Answer 1

Used for respiration and is the bilayer of plasma membranes

Question 2

4 lipid groups

Answer 2

Triglyceride (fats and oils)

Phospholipids

Cholesterol

Steroids

Question 3

Emulsion test for lipids

Answer 3

Crush sample and add ethanol

Get rid of solid then add distilled water

Cloudy white emulsion= lipids present

Question 4

Functions of lipids in living organisms

Answer 4

Insulate and heat us up

Energy store

Cell membranes

Organ protection

Used for respiration

Question 5

Hydrophilic

Answer 5

Charger molecules and will mix and dissolve in water

Question 6

Hydrophobic

Answer 6

Not charged so won’t mix in with water

Question 7

Saturated

Answer 7

Means a hydrocarbon chain had no c=c double bonds

Question 8

Unsaturated

Answer 8

Means a hydrocarbon chain has 1 or more C=C double bonds

Question 9

Triglycerides

Answer 9

One molecule of glycerol with 3 fatty acids attached to it

Question 10

Phospholipids

Answer 10

found in cell membranes- 1 glycerol, 2 fatty acids & a phosphate group

Question 11

Triglyceride structure & function

Answer 11

Contain lots of energy- chemical energy in tail released when they are broken down.
Insoluble- doesn’t affect water potential
Hydrophobic fatty acid tails

Question 12

Phospholipids structure & function

Answer 12

Make up cell membrane bilayers
Hydrophillic heads and hydrophobic tails- water soluble substances can’t easily pass through the centre of cell membrane.

Question 13

Why are lipids not polymers?

Answer 13

Their monomers aren’t the same.
They are still formed by condensation reactions