1.) Outline the classification of proteins based on the polarity and how are they further classified based on the presence of the R-groups present in the amino acid structure?
CLASSIFICATION OF AMINO ACIDS BASED ON POLARITY There are 4 main classes of amino acids based on polarity, i.e. the interaction of the R group with water molecules at physiological pH . Amino acids with non-polar (hydrophobic) side chain These amino acids have a non–polar hydrophobic side chain. They do not provide protons or participate in hydrogen or ionic bonding. E.g.: alanine, valine, leucine, isoleucine, proline, phenylalanine, tryptophan and methionine. Amino acids with uncharged polar side chains (- R group) These amino acids are more soluble in water. They are hydrophilic in nature. The functional groups can make hydrogen bonds with water. E.g.: glycine, serine, threonine, tyrosine, cysteine, asparagine and glutamine. The polarity of serine, threonine is due to the presence of hydroxyl groups; the polarity of asparagine and glutamine is due to the amide group and the sulfhydryl group (thiol group) is...