Proteins

Question 1

Explain the role of hydrogen bonding in maintaining the secondary structure of proteins such as salivary amylase

Answer 1

Hydrogen bonds maintain structure of a-helice or b-pleated sheets

Question 2

Explain the role of hydrogen bonding in maintaining the tertiary structure of proteins such as salivary amylase

Answer 2

• Hydrogen bonds stabilize polypeptides
• Helps to maintain 3D shape of polypeptide

Question 3

How does the structure of haemoglobin allow it to be soluble in water

Answer 3

• folding of polypeptide chains to form globular structure
• hydrophilic R group outside the molecule and hydrophobic R groups on the inside
• this allows hydrogen bonds to form with the water molecule