biological molecule testing

Question 1

what agent do u use to test for starch

Answer 1

iodine

Question 2

what agent do u use to test for a reducing sugar

Answer 2

benedict’s solution and heat for 5 mins at 80°C

Question 3

what is a reducing sugar include

Answer 3

all monosaccharides and some disaccharides

Question 4

what’s the test for non reducing sugars

Answer 4

add hydrochloride acid then sodium carbonate then benedict’s and heat for 5 mins at 80°C

Question 5

what is the positive result for non reducing sugars

Answer 5

green-very low
yellow-low
brown- medium
brick red- high

Question 6

what is the negative result for non reducing sugars

Answer 6

blue

Question 7

what is the test for lipids (emulsion)

Answer 7

add ethanol then decant distilled water

Question 8

what is the positive result for lipids

Answer 8

cloudy emulsion

Question 9

what is the negative result for lipids

Answer 9

clear

Question 10

what does a colorimeter test for

Answer 10

reducing sugars

Question 11

how to use colorimeter

Answer 11

-shine light through sample
-use pipette to take super

Question 12

what is the agent used to test for proteins

Answer 12

biuret solution

Question 13

what is the positive test for proteins

Answer 13

turns from blue to purple