lipid review

Question 1

what is a lipid

Answer 1

biomolecules that contain fatty acids or a steroid nucleus

Question 2

describe the solubility of lipids

Answer 2

soluble in organic solvents but NOT IN WATER

Question 3

what are the different types of lipids

Answer 3

1. fatty acids
2. steroids
3. waxes
4. triacylglycerols

Question 4

when are fatty acids saturated and unsaturated

Answer 4

saturated when they do not contain double bonded carbon atoms

Question 5

describe the properties of saturated fatty acids

Answer 5

1. contain only single C-C bonds
2. have strong dispersion forces between long carbon chains
3. have higher melting points & are usually solids at room temperature

Question 6

describe the properties of unsaturated fatty acids

Answer 6

1. the cis double bonds cause the carbon chains to bend/kink; which gives the molecule an irregular shape and allows fewer interaction between molecules

Question 7

what are some of the functions of prostaglandins

Answer 7

1. lowering or raising blood pressure
2. stimulating contraction and relaxation of the smooth muscle of the uterus
3. produces inflammation and pain @ the site of an injury

Question 8

define waxes

Answer 8

esters of saturated fatty acids & long-chain alcohols, each containing from 14-30 carbon atoms