T7 - Biological Molecules

Question 1

test for protein

Answer 1

add biuret solution it will turn from blue to violet/purple

Question 2

test for starch

Answer 2

add iodine solution - it will turn from orange-brown to blue/black

Question 3

test for glucose

Answer 3

add benedict’s solution and heat in a water bath for 5 mins - it will turn from blue to orange/brick red

Question 4

structure of a carbohydrate molecule

Answer 4

it is a starch molecule made up of glucose

Question 5

structure of proteins

Answer 5

made up from long chains of amino acids

Question 6

test for lipids

Answer 6

add ethanol and cold water - cloudy emulsion will form

Question 7

Elements present in Carbohydrates

Answer 7

Carbon, Oxygen and Hydrogen

Question 8

elements present in protein

Answer 8

carbon, oxygen, hydrogen and nitrogen

Question 9

what is the structure of fats

Answer 9

fats are made up of triglycerides. They are made of one one glycerol molecule bonded to three fatty acid chains

Question 10

elements present in lipids

Answer 10

carbon, oxygen and hydrogen