UNIT 1 (topic 3) lipids

Question 1

examples of lipids

Answer 1

oils, fats, steroids, hormones

Question 2

what elements are in a lipid

Answer 2

carbon, hydrogen, oxygen

Question 3

properties of lipids

Answer 3

non polar, hydrophobic, insoluble but soluble in organic solvents, don’t form polymers

Question 4

explain the structure of a triglyceride

Answer 4

glycerol bonded with ester bonds to 3 fatty acids

Question 5

what is the difference between saturated fatty acid and unsaturated fatty acid

Answer 5

saturated = all single bonds
unsaturated = one or more double bonds

Question 6

explain why lipids are a good source of energy

Answer 6

triglyceride = lots of bonds
energy stored in the bonds of a molecule

Question 7

explain why lipids are good for waterproofing

Answer 7

hydrophobic - repels the water and stops water loss

Question 8

what do lipids insulate (thermal and electrical)

Answer 8

thermal = blubber on whales
electrical = myelin sheath

Question 9

why would lipids be good protection

Answer 9

shock absorbers and forms cushioning effect = vital organs

Question 10

explain why lipids don’t effect water potential

Answer 10

non-polar - insoluble as no partial charges
repelled by polar molecules