Proteins

Question 1

Outline the 3 structures of proteins

Answer 1

Primary
Secondary
Tertiary

Question 2

Outline the formation of the primary structure of proteins

Answer 2

Chain of amino acids - forms polypeptides
Linked by amide links in condensation polymerisation

Question 3

Outline how an Amide link forms

Answer 3

When an O-H from R-COOH bonds with a H from an R-NH2

Question 4

Outline an example of the primary structure of a protein

Answer 4

Alanine - aspartic acid - cysteine

Question 5

Outline the secondary structure of a protein

Answer 5

Hydrogen bonds between the polypeptides
Between C=O and N-H in amide link
Forms Beta-pleated sheet (spiral staircase)

Question 6

Outline the Tertiary structure of proteins

Answer 6

Ionic bonds, disulfide bonds

Question 7

Outline the ionic bonds in protein tertiary structure

Answer 7

When oppositely charged amino acids are close to each other in the protein

Question 8

Outline the disulfide bond in protein tertiary structure

Answer 8

When 2 sulfur branches in a polypeptide bond together due to cysteine residues being in the molecule