Proteins

Question 1

How do amino acids bond?

Answer 1

By condensation reaction

Question 2

What bond from a between amino acids?

Answer 2

Peptide bond

Question 3

What does the Primary structure of a protein consist of?

Answer 3

Sequence of amino acids in polypeptide chain (peptide bonds only)

Question 4

What does the Secondary structure of a protein consist of?

Answer 4

Hydrogen bonds - creating an Alpha Helix or Beta pleated sheet

Question 5

What does the Tertiary structure of a protein consist of? (Between R groups (4))

Answer 5

1. Hydrogen Bonds
2. Ionic bonds - between + and - r groups
3. Disulphide bridge - between cysteine, containing sulphur
4. Hydrophobic interaction - hydrophobic r groups fold up molecule

Question 6

What structure does a tertiary structure give a protein?

Answer 6

Specific 3D structure, creating a globular protein

Question 7

What does the Quaternary structure of a protein consist of?

Answer 7

When more than one polypeptide is involved in the structure (held by H bonds)

Question 8

What are two examples of quaternary structure?

Answer 8

Haemoglobin - 4 polypeptides; 2 alpha 2 beta

Collagen - fibrous protein made of 3 interwoven polypeptide (no tertiary 3D structure) with staggered ends

Question 9

What is the monomer/polymer of proteins?

Answer 9

Polymer - polypeptide

Monomer - amino acids