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Proteins are "folded" molecules there is not one shape, each protein is different.

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A protein has a primary structure which folds into a secondary structure (alpha helix or B-sheet) and then has a tertiary structure (its 3D fold). Many proteins can complex together to create a quaternary structure.

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Depending on the type of protein and the environment that the protein is in determines its "shape". The hydrophobic effect plays a huge role in this. Membrane proteins are in a hydrophobic environment, and cytosolic proteins are in a hydrophilic environment.

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If you are referring to an amino acid which is a polypeptide monomer, then amino acids have a tetrahedral shape around the alpha carbon.

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also known as a messy group of coat hangers

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Janice Connelly

Lvl 10
4y ago

What else can I help you with?