Lipids

• A student investigated the effect of lipase concentration on the hydrolysis of lipids. Give the suitable control for this investigation

  Boiled lipase solution (Always a boiled enzyme!)
• Name 2 types of unsaturated fatty acids

  Mono-unsaturated (1 bond) and Polyunsaturated (Many bonds)
• How does the structure of phospholipids effect the function of the lipid?(1)

  Phospholipid bilayer - acts as a barrier allowing in molecules and ions in and out of the cell membrane. It creates a semi permeable membrane.
• How does the structure of phospholipids effect the function of the lipid?(2)

  Phospholipids form glycolipids - Short chain carbohydrate
• How does the structure of phospholipids effect the function of the lipid?(3)

  Acts as a marker to detect whether a cell in the immune system is foreign or self.
• How does the structure of phospholipids effect the function of the lipid?(4)

  Helps distinguish between cells so that similar cells can join together. E.g tissue cells join together to form tissue
• How the structure of triglycerides relates to its function?(1)

  High ratio of hydrogen to carbon so water is released when oxidised
• How does the structure of triglycerides relate to its function?(2)

  Lots of C-H bonds for storage of energy
• How does the structure of triglycerides effect its function?(3)

  Low mass to energy ratio
• How the structure of triglycerides relates to its function? (4)

  Large non-polar C-H bonds, therefore triglycerides do not effect/interfere with osmosis
• What is a polar molecule?

  A molecule which is negatively charged on one end and positively charged on the other. A charge separation.