1.2.6 - Protein structure

Question 1

Describe the primary structure

Answer 1

Sequence of a chain of amino acids

Question 2

Describe the secondary structure

Answer 2

Folding of polypeptide chain into helicies or pleated sheets

Question 3

Describe the tertiary protein structure

Answer 3

3D folding pattern of protein due to side interactions
Held together by bonds between R groups.

Question 4

Describe the quaternary structure

Answer 4

Protein consisting of more than one amino acid chain

Question 5

Individual tubulin molecules are globular with a diameter of 25 nm.
Describe the differences between a fibrous protein and an individual tubulin molecule

Answer 5

Fibrous proteins have little or no tertiary structure unlike globular proteins.
Fibrous proteins are insoluble whereas tubulin can be semi-soluble in water.
Fibrous proteins are made from long chains with cross-linkages whereas tubulin has a globular shape.

Question 6

What type of bonding is involved in the secondary and tertiary structures of a protein?

Answer 6

Hydrogen only.