Amino 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.
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- At the physiological pH in the human body, amino acids are typically in the zwitterionic form. What is a zwitterion? A. A molecule that has parts that are charged but has an overall neutral charge. B. A molecule that has parts that are neutral but has an overall positive or negative charge. C. A molecule that has is charged at physiological pH. D. A molecule that has more than 1 charged ion.Which part of the amino acid varies between different types of amino acids? A. The amino group B. The carboxyl group C. The side chain D. All of the aboveWhich 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 varies
- Which of the following is TRUE, if the protein pH is electrically neutral? Refer to the graph below. a. The denaturation of protein is lower than 100% b. The denaturation of protein is greater than 100% c. The protein is in native form d. The protein is completely denaturedA. A solution of amino acid having carboxylic side chain was titrated against NaOH. If the initial pH of the solution was 2.8. Describe the state of the functional groups of the amino acid at the initial pH and at 10.5 B. Briefly explain how you will separate amino acid mixture using the change difference between amino acids. C.A given glycine solution was titrated against NaOH and pH of the final solution was 4.8. Given that pKa1 and pKa2 of the glycine are 2.34 and 9.60 respectivel. Calculate the concentration of the dissociated amino acid in terms of the undissociated amino acid. If [x] and [y] are the concentration of dissociated and undissociated amino acid respectively.A. The following are pairs of fatty acids. Select the fatty acid that has theHIGHER MELTING POINT. FA 1 is the first FA of the pair; FA 2 is the second FA of the pair. Example: A and B (A is FA 1; B is FA 2) CHOICES: FA 1 FA 2 14:0 and 18:0 20:4 and 20:5 18:3 and 20:3 16:0 and 16:1 B. The following are pairs of fatty acids. Select the fatty acid that has theLOWER MELTING POINT. FA 1 is the first FA of the pair; FA 2 is the second FA of the pair. Example: A and B (A is FA 1; B is FA 2) FA 1 FA 2 18:0 and 18:1 18:2 and 18:3 14:0 and 16:0 18:1 and 20:0
- For no. 1–2, refer to the figure below. 1. Which part of the fatty acid will likely interact with water? A. 1 B. 2 C. Both 1 and 2 D. Either 1 or 2 2. Which part of the fatty acid will likely interact with hexane? A. 1 B. 2 C. Both 1 and 2 D. Either 1 or 2Which of the following statements about trans-fatty acids is/are FALSE? A. Healthier than saturated FA. B. May be present in butter substitutes. C. Properties are similar to saturated FA. D. Formed from the hydrogenation of C=C.Which of the following might cause the denaturation of a protein? Select all that apply. A.)Highly acidic conditions B.)Highly basic conditions C.)High concentrations of salt D.)High heat
- Which of the following statements about trans-fatty acids is/are FALSE? a.Healthier than saturated FA. b.Formed from the hydrogenation of C=C. c.May be present in butter substitutes. d.Properties are similar to saturated FA.In dehydration synthesis, watera. is removed from a protein.b. is added to a protein.c. is added to amino acids.d. is removed from amino acids.which 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 binding