BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are hydrophillic and found buried within proteins
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They are hydrophillic and found on protein surfaces
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They are hydrophobic and found within proteins
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They are hydrophobic and found on protein surfaces
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Detailed explanation-1: -The non polar molecule wants to be as far away from the water polar water molecule as possible. That is the reason why the molecule will be found inside the protein. Since our group is non polar, it will be buried within the proteins. The correct answer is choice.
Detailed explanation-2: -The non-polar amino acids (shown here) include: alanine, cysteine, glycine, isoleucine, leucine, methionine, phenylalanine, proline, tryptophan, tyrosine and valine.
Detailed explanation-3: -The tryptophan has an indole side chain which is characterized as a heterocyclic group that is mostly made up of carbon and hydrogen atoms but contains one nitrogen atom. Due to the heterocyclic R-group of the amino acid that has a large nonpolar character, tryptophan is considered a hydrophobic molecule.
Detailed explanation-4: -These results imply that free cysteines behave as strongly hydrophobic, and not hydrophilic, residues in proteins.
Detailed explanation-5: -Tryptophan, despite its value of-0.9 in the Kyte-Doolittle scale, has been classified in the IMGT ‘hydrophobic’ class, as it participates to the hydrophobic core of the structural domains.