CH 600 Lc
PROTEINS AND PEPTIDES
1 . How do D-amino stomach acids differ from L-amino acids? What biological tasks are played by peptides that contain D-amino acids? installment payments on your For each from the following, identity an valine in which the 3rd there�s r group contains it: a hydroxyl group, a sulfur atom, a second chiral carbon atom, a great amino group, an amide group, a great acid group, an aromatic ring, and a branched side cycle. 3. Foresee the predominant ionized kinds of the following amino acids at ph level 7: glutamic acid, leucine, threonine, histidine, and arginine. 4. Draw structures from the following proteins, indicating the charged form that is present at ph level 4: histidine, asparagine, tryptophan, proline, and tyrosine. a few. Calculate the isoelectric point of each from the following proteins: glutamic acid, serine, histidine, lysine, tyrosine, and arginine. 6. Advise a reason so why amino acids are usually more sencillo at pH extremes than they are by neutral pH. 7. Depending on the pKa values from the amino acids, can there be any amino acid that could function as a stream at pH 8? If so , what kind? 8. If you were to have a mythical amino acid based on glutamic acid, but one out of which the hydrogen that is attached to the g-carbon were substituted by one other amino group, what would be the predominant sort of this valine at pH 4, 7, and twelve, if the pKa value were 10 for the unique amino group? 9. Consider the peptides Ser—Glu—Gly—His—Ala and Gly—His—Ala—Glu—Ser. How do the two of these peptides change? 10. Precisely what is the stereochemical basis of the observation that D-aspartyl-D-phenylalanine includes a bitter flavor, whereas L-aspartyl-L-phenylalanine is drastically sweeter than sugar?