Types of Proteins

Question 1

What type of protein is Haemoglobin?

Answer 1

Globular

Question 2

What are prosthetic groups?

Answer 2

Inorganic groups (like iron) that are attached onto the protein (non-protein themselves)

Question 3

Structure of Haemoglobin?

Answer 3

Has 2 alpha chains and 2 beta chains ; forming an alpha helix shape

Question 4

Position of Heme groups?

Answer 4

These iron Fe2+ ions are in the middle of the porphyrin rings

Question 5

Catalase structure?

Answer 5

Quarternary structure consist of 4 polypeptide chains with 4 heme groups

Question 6

Function of catalase

Answer 6

Produced in liver and breaks down harmful hydrogen peroxide (result of metabolism) into water and oxygen preventing it from accumulating and damaging DNA

Question 7

Insulin structure

Answer 7

Insulin is formed of 2 polypeptide chains (quaternary structure) and both are joined together by main disulphides bridges

Question 8

Properties of insulin?

Answer 8

It is a globular protein and thus is soluble - very compact and has role in reactions with a wider range of amino acids (making it globular instead of a smaller repetitive range for structural)

Question 9

How is insulin arranged?

Answer 9

Hydrophobic R groups in the middle and hydrophilic on the outside