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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- Define the following terms:a. aldol condensationb. a-carbonc. hydrophobic amino acidd. secondary structuree. b-pleated sheetWhich of the groups below is capable of only hydrophobic interactions? a b c d eAdding 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* concentration
- 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. clathrateWhich 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 solution
- A 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 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 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 biochemistryBME (high concentration) disrupts Disulfide linkages Accelerating disulfide cross-linking. Olonic Interactions OH-bonds in proteins.Which of the following is not true about a-amino acids? have at least 2 pka values O negatively charged at pH = 1.0 most contain one chiral center can act as buffers
