Protein structure

Question 1

Primary structure

Answer 1

Number of amino acids in the polypeptide chain.
3D arrangement determines enzyme active site

Question 2

Secondary

Answer 2

Hydrogen bonds forming between amino group + carboxyl
e.g alpha helix and beta plated sheets

Question 3

Tertiary

Answer 3

Leads to further bonds being formed between r groups:
- hydrogen
- disulphide
- ionic

e.g globular protein:
- enzymes
- hormones
- antibodies

Question 4

Quaternary

Answer 4

Occurs in proteins that have more than one polypeptide chain working together
e.g hb