Proteins

Question 1

Structure of proteins

Answer 1

Made from long chain of amino acids
Proteins are polymers
Amino acids are monomers in proteins
Dipeptide formed when two amino acids join together
Polypeptide is formed when more than two amino acids join together
Proteins are made up of one or more polypeptides

Question 2

Amino acids

Answer 2

Linked together by peptide bonds to form dipeptide / polypeptide
A molecule of water molecules released - condensation reaction
Add a molecule of water - hydrolysis reaction

Question 3

4 Structural levels of protein

Answer 3

Primary
Secondary
Tertiary
Quaternary

Question 4

Primary structure

Answer 4

Sequence of amino acids in polypeptide chain
Different proteins have different sequences of amino acids
A change of amino acids may change the structure of the whole protein

Question 5

Secondary structure

Answer 5

Polypeptide chain doesn’t remain flat and straight
Hydrogen bonds form between amino acids

Question 6

Tertiary structure

Answer 6

Coiled and folded chain of amino acids
Made from single polypetide chain- 3D structure