25. Haemoglobin and collagen

What kind of protein is haemoglobin?

Globular protein

How many polypeptides in haemoglobin?

4

Describe the structure of haemoglobin?

Curled up

What happens because haemoglobin is curled up

Hydrophilic side chains face out and hydrophobic side chains face in

What does the fact hydrophobic side chains face in and hydrophilic side chains in mean?

Makes haemoglobin soluble so good for transport in blood

Describe the polypeptides in haemoglobin?

Each is polypeptide is different (4 genes or haem)

What is haemoglobin associated with?

Non protein groups (haem)

What structure does haemoglobin have?

Quaternary

What kind of protein is collagen?

Fibrous

How many polypeptide chains does collagen have?

3 tightly coiled into strong triple helix

Describe the polypeptides in collagen?

Each is the same (only 1 gene needed to code for collagen)

How are polypeptide chains joined in collagen?

Covalent bonds

What can bind to collagen?

Minerals can bind to triple helix to increase strength

What is collagen not associated with?

Non protein groups