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Both. 1. proteins are polymers with individual subunits (amino acids joiled together in amide linkages) which may be highly polar, highly non-polar, or intermediate. The most polar or non-polar parts are the "side chains". 2. proteins usually fold with the polar side chains out toward the water and the non-polar side chains toward the interior. But there are usually polar groups in the interior as well. The main chain of amide bonds fundamentally polar but is quite happy to be buried in the interior because the polar groups associate to make the "secondary structures" such as helices ("alpha") or sheets ("beta") 3. some proteins have patches of non-polar surface exposed - these are often involved in binding other proteins, membranes, non-polar molecules, etc. 4. some proteins, such as some storage proteins and intrinsic membrane proteins, have large areas of non-polar surface.

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16y ago
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8y ago

Some proteins are polar (hydrophilic) and some proteins are non-polar (hydrophobic), it depends on their function. Also, some proteins can have both polar and non polar regions in their structure

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9y ago

Proteins are complex biomolecule known so far which are made up of amino acids side chains which can be netural, aromatic, polar and non polar amino acids. Polar amino acids such as Histidine, argineine tend to be placed on the surface region of the molecule where they can form hydrogen bonds with surrounding environment (water and other polar molecules). In contrast non polar amino acids such as Tryptophan, phenylalanine, leucine, cluster themselves to form hydrophobic core, thereby avoiding contact with water and surrounding polar environment.

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15y ago

DNA is polar due to highly charged phosphate backbone.

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13y ago

nonpolar

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10y ago

polar

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11y ago

Polar

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Q: Are polypeptides polar or non polar?
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