Proteins

Question 1

Explain how a change in the primary structure of a globular protein may result in a different three-dimensional structure.

Answer 1

sequence of amino acids changes;
tertiary structure changes / folds in a different way;
bonds form in different places;

Question 2

Describe the structure of proteins.

Answer 2

Polymer of amino acids;

2. Joined by peptide bonds;
3. Formed by condensation;
4. Primary structure is order of amino acids;
5. Secondary structure is folding of polypeptide chain due to hydrogen bonding;

Accept alpha helix / pleated sheet

6. Tertiary structure is 3-D folding due to hydrogen bonding and ionic / disulfide bonds;
7. Quaternary structure is two or more polypeptide chains.