Non-polar aminoacids: 0 Uncharged Usually form the core of the protein globula Have several NH2 groups Interacts with acids in protein
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- Of the 20 protein-derived amino acids shown in Table 27.1, which contain Q.) no chiral centerA) List each of the five major functional classes of proteins. B) Discuss the function for each class, give an example of a protein for each class and mention how the function of the protein example fits the function of the class (40 words or less for each class with its exampleGive at least 10 functions of protein and describe each function. Cite an example for each function if there are any.
- n each of the following two groups of aminoacids, which amino acid would be the easiest to distinguish fromthe other two amino acids in the group, based on a titration?(a) gly, leu, lys(b) glu, asp, serWhich of the following amino acids is most likely to be found on the outside of a soluble protein? Which is more likely to be found on the inside? Explain each answer. (Hint: Consider the effect of the amino acid side chain in each case and that the protein is folded up into its globularform.)(a) Leucine (b) Glutamate(c) Phenylalanine (d) GlutamineAre amino acids other than the usual 20 amino acidsfound in proteins? If so, how are such amino acids incorporatedinto proteins? Give an example of such an amino acid and a protein in which it occurs.
- What amino acids are most likely to be found in the core of a water-soluble globular protein? a) Polar but unchargedb) Hydrophobicc) Positively chargedd) Negatively chargedWould you expect a carboxylic acid group within the waterfree interior of a protein to have a higher or lower Kathan itwould have if it occurred on the protein’s surface, where itis hydrated?Identify the polar amino acids, the aromatic amino acids,and the sulfur-containing amino acids, given a peptide with thefollowing amino acid sequence:Val-Met-Ser-Ile-Phe-Arg-Cys-Tyr-Leu
- A new amino acid is found with the alpha N and backbone COOH pKa's the same as histidine but with a neutral side chain. What is the isoelectric point of this new amino acid?Indicate the level(s) of protein structure to which each of thefollowing contributes:a. amino acid sequenceb. b-pleated sheetc. hydrogen bondd. disulfide bondProvide for each amino acid the names that will uniquely identify all ionisable groups and indicateindividual charges associated with these groups and the overall charge of the amino acid.