Biology - F212

Biological Molecules

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Structures

Primary structure is the sequence of amino acids found in a protein molecule.

Secondary structure is the coiling or folding parts of a protein molecule due to the formation of hydrogen bonds formed as the protein is synthesised. The main forms of secondary structure are the α-helix and β-pleated sheets.

Tertiary structure is the overall 3D shape of a protein molecule. It is the result of interactions between parts of the protein molecule such as hydrogen bonding, formation of disulfide bridges, ionic bonds and hydrophobic interactions.  

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