Unit 2: Proteins

Question 1

What kind of molecules are proteins?

Answer 1

Polymer molecules, enzymes are biological catalysts.

Question 2

Amino acid functional groups

Answer 2

Carboxyl (-COOH) and Amino (-NH²)

Question 3

Formation of amino acids

Answer 3

Condensation reaction, elimination of water. Peptide link formed (CONH)

Question 4

Breaking down of proteins

Answer 4

Hydrolysis, water causes splitting. Can be hydrolysed using concentrated sulphuric acid (HCl). Can be identified using chromatography.

Question 5

Intermolecular bonding in proteins

Answer 5

Long chain molecules form spirals, sheets.
Hydrogen bonding
When heated, denaturation happens and proteins change shape - thus changing the texture in foods when cooked.