3. In what direction (toward the anode, toward the cathode, or toward neither) will the following proteins move in an electric field? a. Serum albumin (pl-4.9) at pH 8.0 b. Urease (pI=5.0) at pH3.0 and pH 9.0 c. Ribonuclease (pI=9.5) at pH 4.5, 9.5 and 11.0 d. Pepsin (pl-1.0) at pH 3.5, pH7.0 and pH 9.5
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- 1. The chromatography solvent is very polar as it contains alcohol, an acid and water. Based on this information, list all the polar amino acids and arrange them from most polar to least polar.2 a. You are trying to purify protein C from a mixture of proteins noted in the above Table. If you had only one type of column to choose from, which one would allow you to purify protein C with the least number of contaminants? Size exclusion column Ion exchange column Affinity chromatography using glucose as the bait Affinity chromatography using NAD as the bait Please explain why you chose the column above based upon the properties of the column AND the proteins in the Table.Which of the following is the best way to judge the relative activation energies between two given chemical reactions? Compare the ?G values between the two reactions Compare their reaction rates Compare their ideal environmental conditions Compare the spontaneity between the two reactions.
- A molecule into which a radioisotope has been incorporated can be used as a(n) ________ . a. compound b. tracer c. salt d. acid1. Which of the following statement/s is/are TRUE for the protein sample?* The sample will give a positive result to Biuret test. All of A, B and C The sample will give a positive result to Ninhydrin test. The sample will give a positive result to Xanthoproteic test. 2. Extremely high pH causes folding of the protein molecules. * The statement is CORRECT. The statement is INCORRECT. 3.Negative with Biuret Test but positive with Ninhydrin Test, Xanthoproteic Test and Millon’s Test Glycine Tryptophan Tyrosine Methionine AlbuminWhich of the following statements about electron microscopy are true?Group of answer options a.By taking pictures of the same protein frozen in ice thousands of times and then adding them together, you get a high-resolution image of the protein b.Electron microscopy is not used in structural biology as it can not give as high a resolution as X-ray crystallography and NMR c.The smaller a protein, the easier it is to solve its structure with electron microscopy dMost existing protein structures have been resolved using electron microscopy e.The first protein structure with true atomic resolution was solved using electron microscopy last year
- 6. THE FOLLOWING ARE DESCRIPTION OF NUCLEIC ACIDS. EXCEPT?A. MADE UP ALSO OF A NUCLEOSIDEB. COMPOSED OF CHAINS OF NUCLEOTIDESC. VERY LARGE, COMPLEX MOLECULESD. POLYMERS OF NON-REPEATING UNITS OF NUCLEOTIDES 7. ALL OF THE FOLLOWING ARE TRUE ABOUT DNA, EXCEPT?A. CONTAINS THE NITROGENOUS BASE URACILB. WITH ALPHA-HELICAL STRUCTUREC. INVOLVED IN PROTEIN SYNTHESISD. GENETIC CARRIER 8. WHICH OF THE FOLLOWING IS/ARE RESPONSIBLE FOR PROTEIN SYNTHESIS?A. T-RNAB. ALL OF THEMC. R-RNAD. M-RNA 9. WHICH OF THE FOLLOWING CAN AFFECT THE DNA STRUCTURE?A. ALL OF THEMB. UVC. BASE ANALOGUESD. IONIZING RADIATION 10. ALL OF THE FOLLOWING ARE PROTEIN ENZYMES, EXCEPT?A. PEPSINB. CHYMOTRYPSINC. PTYALIND. TRYPSIN1. What is the isoelectric point (pI) of lysine which has pKa values of 2.1 for the α carboxyl group, 9.7 for the α amino group and 10.5 for the side chain amino group? 2. Which of the following is most likely to be found on the exterior of a protein? A) Pro B) Trp C) Ser D) Glu 3. The type of reaction that forms a peptide bond is A) Elimination B) Hydrolysis C) Nucleophilic substitution D) Condensation2 If a protein is predominantly made up of aliphatic and aromatic amino acids, which of the following is most likely true about such protein? Select the correct responses): a. It is a protein with a net negative charge b. It is most probably a structural protein. c. It is a protein that is cationic in nature. d. It is a protein that is hydrophobic in nature. e. It is most probably a catalytic protein. f. It is a water-solube protein. g. It is most probably a carrier protein.
- 2. Imagine you have 3 different crystals and 3 agar gel plates (Agar is a gel used in microbiology preparations). The crystals and their molecular weight is given below. If you place same amount of solution into a hole made in your agar gel plate and wait an hour the crystals will diffuse (see figure 1). a. Methylene blue (molecular weight (MW) is 319.85 g/mol); b. Potassium permanganate (MW is 158.03 g/mol); c. Nigrosin (MW is453.5 g/mol) Explain possible explanations for the differences noted among the diffusion rates of the three chemicals.Which of the following statements about electron microscopy are true? a) Most existing protein structures have been resolved using electron microscopy b) Electron microscopy is not used in structural biology as it can not give as high a resolution as X-ray crystallography and NMR c) The smaller a protein, the easier it is to solve its structure with electron microscopy d) By taking pictures of the same protein frozen in ice thousands of times and then adding them together, you get a high-resolution image of the protein e) The first protein structure with true atomic resolution was solved using electron microscopy last year3. How will you prepare 500 ml of 0.750 M citrate buffer with pH of 4.25 from solid citric acid (C6H8O7) and solid sodium citrate (Na3C6H5O7). The Ka of citric acid is 7.40 x 10-4 . Given: • (Na3C6H5O7) solid sodium citrate = conjugate base in molarity [? −] • (C6H8O7) solid citric acid = weak acid in molarity [??] • 7.40 × 10−4 ?? of citric acid = ??? (acid-dissociation constant) • 500 ml of 0.750 M citrate buffer
