proteins and enzymes

Question 1

proteins structure levels

Answer 1

Structural levels of protein
Primary structure:
• Sequence of amino acids in the polypeptide chain;
Secondary structure:
• Hydrogen bonds form between the amino acids;
• Chain thus coils into an alpha helix/beta-pleated sheet;
Tertiary structure:
• Further coiling occurs;
• More bonds form between different parts;
• Regarding proteins from a single polypeptide chain, this is their final 3D structure;
• Bonding determined by R groups;
• Held by disulphide bridges > ionic bonds > hydrophobic & hydrophilic interactions
> denotes the greater strength of the bond
Quaternary Structure:
• Made from many polypeptide chains - this structure is their final 3D structure