Are polypeptides polar or non polar?

Answer 1

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.

Answer 2

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

Answer 3

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.

Answer 4

Polypeptides can be either polar or nonpolar, depending on the amino acid residues present in the sequence. Amino acids with charged or polar side chains contribute to the overall polarity of the polypeptide, while those with nonpolar side chains tend to make the molecule more hydrophobic and less polar.

Answer 5

DNA is polar due to highly charged phosphate backbone.

Answer 6

nonpolar

Answer 7

polar

Answer 8

Polar