Which of the following describes the interaction between the amino acid last eluted and the anion exchanger at pH 7? a. dipole-dipole b. hydrophobic c. ionic d. H-bonding
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- Adding HCO3 to a solution will cause the concentration of H* to - and the pH to. Select one: O a. increase; increase O b. increase; decrease O c. decrease; increase O d. decrease; decrease O e. HCO3 has no effect on H* concentrationWhich of the groups below is capable of only hydrophobic interactions? a b c d eDefine the following terms:a. aldol condensationb. a-carbonc. hydrophobic amino acidd. secondary structuree. b-pleated sheet
- You have a mixture of 4 amino acids (Q, W, E, R, T) that you want to separate using ion exchange chromatography. Which of these amino acids would bind most strongly to a DEAE anion exchange column at pH 7? Q W E R TDefine the following terms: a. solvation sphere b. amphipathic c. micelle d. hydrophobic effect e. clathrateA conjugate acid-base paira. acts as a buffer.b. can combine with H+ in a solution.c. can release H+ to combine with OH−.d. describes carbonic acid (H2CO3) and bicarbonate ions (HCO3−).e. All of these are correct.
- The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following questions about the amino acid. 2 1.5 1 0.5 -0.5 -1 4 8 10 12 14 pH a. Which of the following triprotic amino acids is this? Histidine b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point falls) (Hint - look up the pka values in the pKa table for amino acids, which was in video one of today's lecture) 7-8 c. What form of this amino acid dominates at a pH of 8? Please select the correct form for each jonizable group. Alpha amino NH3+ Alpha carboxyl СОО- R| NH Net ChargeWhich would be an overall explanation for how a buffer works? O The conjugate base ions in the buffer solution resists changes in pH by reacting with any hydroxide ions added to the buffer solution O None of the choices The undissociated acid molecules in the buffer solution resists changes in pH by reacting with any acid H+ ions added to the buffer solution O The mixture of ions and molecules in a buffer solution resists changes in pH by reacting with any hydrogen ions or hydroxide ions added to the buffer solutionWhich of the following statements regarding hydrogen bonding is false? Hydrogen bonding occurs between the hydrogen o* and lone pair electron o orbitals There is a strong angle dependence of hydrogen bonding, with ideal angle of 180° The donor is a weak base and the acceptor is a weak acid Hydrogen bonding occurs between the hydrogen atom of an electronegative donor and a lone pair of electrons on an acceptor It is one of the most important non-covalent bonds in biochemistry
- BME (high concentration) disrupts Disulfide linkages Accelerating disulfide cross-linking. Olonic Interactions OH-bonds in proteins.which of the following statements is correct regarding the affect of pH on the ionization of R groups in amino acids. Put yes or no next to each number. 1) at an acidic pH, amino groups in an R group tend to lonize by accepting a proton and have a positive charge2) at an acidic pH, carboxyl groups in an R group are likely to be in an unionized state.3) at an alkaline pH, amino groups in an R group have a tendency to remain unionized (and uncharged).4) at an alkaline pH, carboxyl groups in an R group have a tendency to lonize by loosing a hydrogen ion (H+)5) R groups that do not have an amino or carboxyl group do not ionize at pH of the environment changes.Which of the following amino acids would be first to elute at pH 6.5 from a cation-exchange column? A. arginine B. alanine OC. glutamine D. glutamic acid O E. glycine