The Chemistry Of Food

Question 1

What are carbohydrates made up of?

Answer 1

Units of sugar

Question 2

What are simple sugars?

Answer 2

• Carbohydrates that contain only one or two sugar units.

* They turn the blue Benedict solution to red when heated.

Question 3

What do complex carbohydrates contain?

Answer 3

• Long chains of simple sugar units bonded together.

* Starch turns the yellow-red iodine solution to blue-black.

Question 4

What do lipids consist of?

Answer 4

• Three molecules of fatty acids bonded to a molecule of glycerol.
• The ethanol test indicates the presence of lipids in solutions.

Question 5

What are protein molecules made up of?

Answer 5

• Long chains of amino acids.

* In the presence of proteins, Biuret reagent turns from blue to purple.