Levels of protein structure and the forces that stabilise them

1. A.
   Ionic bonding
2. B.
   Hydrogen bonding
3. C.
   vander Waals forces
4. D.
   Covalent bonding

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1. A.
   Peptide bond
2. B.
   glycosidic bond
3. C.
   Hydrogen bonding
4. D.
   van der Waals forces

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1. A.
   dipolar interaction
2. B.
   H-bonding interaction
3. C.
   van der Waals forces
4. D.
   $\pi$-stacking interaction

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1. A.
   H-bonding
2. B.
   -S-S-linkage
3. C.
   -O-O-linkage
4. D.
   van der Waals forces

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1. A.
   quaternary structure
2. B.
   primary structure
3. C.
   secondary structure
4. D.
   tertiary structure

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1. A.
   They can be fibrous or globular in structure.
2. B.
   The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.
3. C.
   The structure remains intact when exposed to pH changes.
4. D.
   A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

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