Biological Molecules - Tests

Question 1

what solution is used to test for starch

Answer 1

iodine

Question 2

if starch is present what colour will the solution go

Answer 2

blue-black

Question 3

what solution do we use to test for proteins

Answer 3

biurets solution

Question 4

if protein is present what colour will the solution go

Answer 4

lilac

Question 5

what solution do we use to test for lipids

Answer 5

ethanol

Question 6

what else do we add to the solution to test for lipids

Answer 6

water

Question 7

what must you do to the lipid testing solution

Answer 7

shake it

Question 8

if lipids are present what colour will the solution go

Answer 8

white cloudy emulsion

Question 9

what are the 2 different categories of sugars

Answer 9

reducing and non reducing

Question 10

what is the definition of a reducing sugar

Answer 10

they can donate an electron to another molecule

Question 11

give an example of a reducing sugar

Answer 11

all monosaccharides

Question 12

what solution do we use to test for reducing sugars

Answer 12

benedicts solution

Question 13

what must we do after adding benedicts to our reducing sugar sample

Answer 13

place the test tube in boiling water for 5 mins

Question 14

if a reducing sugar is present what colour does the solution go

Answer 14

a brick red precipitate forms

Question 15

give an example of a non reducing sugar

Answer 15

sucrose

Question 16

what solution do we use to test for a non reducing sugar

Answer 16

hydrochloric acid
(gently boil for 5 mins)

Question 17

if a non reducing sugar is present what color does it go

Answer 17

orange