B4 Biological molecules

Question 1

List the chemical elements that make up:
carbohydrates, fats and proteins

Answer 1

carbs and fats: carbon, hydrogen, oxygen
proteins: carbon, hydrogen, oxygen and nitrogen

Question 2

glucose (polysaccharides) breaks down to:

Answer 2

starch, glycogen and cellulose

Question 3

proteins break down to:

Answer 3

amino acids

Question 4

fats and oils break down to:

Answer 4

fatty acids and glycerol

Question 5

iodine solution test

Answer 5

for starch: used to detect the presence of complex carbs (orange-brown to blue-black)

Question 6

Benedict’s Solution Test

Answer 6

for reducing sugars (blue to brick red)
-warm water bath after mixing solutions

Question 7

Biuret test

Answer 7

for proteins: blue to purple

Question 8

Ethanol emulsion test

Answer 8

for fats: cloudy white emulsion