lipids

• are lipids polymers

  why

  no theyre not as theyre not made up of repeating units

  theyre macromolecules
• what is a macromolecule

  made up of sub-units
• 3 types of lipids

  triglycerides (fats), phospholipids, steroids
• what is the composition of lipids

  large amounts of C, H and small amounts of O
• are lipids soluble in water or not

  no theyre insoluble

  because theyre non-polar
• what is glycerol made up of

  hydrocarbon chain and hydroxyll groups
• what are fatty acids made up of

  COOH group attatched to a hydrocarbon chain
• what is the difference between unsaturated and saturated

  unsaturated have 'kinks' which are double bonds
• what is a polyunsaturated lipid

  with lots of double bonds
• how do saturated lipids exist at room temp

  solid because they have no double bonds so are more closely packed together
• what is esterification

  ester bond is formed

  condesnation polymerisation between glycerol and 3 fatty acids -- triglycerides
• what can triglycerides be used for

  electrical/thermal insulation

  buoyancy

  protection

  water storage

  energy storage
• what is a steroid

  complex alcohol molecules

  lipid found in cell
• what is the structure of a steroid

  4 carbon ring structure

  hydrophyllic hydroxyll group at one end

  rest is hydrophobic
• what is a sterol

  an individual steroid
• what is an example of a sterol

  cholesterol