4. biological molecules

Question 1

list the chemical elements that make up carbohydrates

Answer 1

carbon, hydrogen, oxygen

Question 2

list the chemical elements that make up lipids

Answer 2

carbon, hydrogen, oxygen

Question 3

list the chemical elements that make up proteins

Answer 3

carbon, hydrogen, oxygen, nitrogen (sulfur)

Question 4

what is glucose made up of

Answer 4

starch, cellulose, glycogen

Question 5

what is proteins made up of

Answer 5

amino acids

Question 5

list the chemical elements that make up DNA

Answer 5

carbon, hydrogen, oxygen, nitrogen, phosphorus (sulfur)

Question 6

what are lipids made up of

Answer 6

fatty acid, glycerol

Question 7

what is DNA made up of

Answer 7

nucleotides

Question 8

what is the chemical test for starch

Answer 8

iodine solution
positive result : blue-black
negative result : orange-brown

Question 9

what is the chemical test for glucose and maltose (sugars)

Answer 9

benedict solution
positive result : green, yellow, orange, brick red
negative result : remains blue

Question 10

what is the chemical test for protein

Answer 10

biuret test
positive result : purple
negative result : remains blue

Question 11

what is the chemical test for lipids

Answer 11

ethanol emulsion test
positive result : milky white emultion
negative result : clear solution