titration of which amino acid is most likely responsible for switching a protein from binding to a cation exchange resin to an anion exchange resin with a shift in ph value from below pH 6 to above pH 6? a. glu b.lys c. his d. arg е. asp
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- Which of the following peptides would reach the positive electrode first if placed in an electrophoresis buffer at pH 7.4 if SDS has not been added? a) Asp-Ile-Thr b) Glu-Pro-Asp c) Lys-Arg-His d) Val-Glu-Ilewhich is true when speaking about the secondary structure of a protein A. invoves R group binding b. involves binding to other protiens c. involves hydrogen bonding of the protien backbone d. involves peptide bindingWhich of the following about protein denaturation is not trueA. It is always irreversible B. It is a shape change C. It may be due to pH / temperature change D. Most of the proteins denature when transferred from aqueous environment to organs solvents E. Its function is lost.
- Which of the following is true regarding proteins A. Absorbance of proteins is directly proportional to the molecular weights B.Proteins react with biuret reagent because of their side chains C. two out of the twenty amino acids can absorb at 280nm D. In proteins the average weight per amino acid residue always variesAmino acids with non-polar side chains are zwitterions at a. middle pH levels, between the pKa’s of the amino and carboxyl groups. b. very low pH, where the hydrogen ion concentration is high. c. none of the above. d. the pKa of the side chain.What happens when the temperature of a protein is lowered below its optimal temperature chose all that apply
- The side chain of which residue can be hydrogen bond donor: a. Thr b. Ala c. Ile d. Pro e. Phehoose the reagents that help unfold the protein molecules into same shape and charge density. a. beta-mercaptoethanol (β-ME) b. poly-acrylamide c. TEMED d. sodium-dodecyl-sulfate (SDS)Beta-mercaptoethanol (BME) disrupts the types of interactions responsible for ____ structure of proteins. (Select all that apply!) a Primary b Secondary c Tertiary d Quaternary
