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A common reaction of two cysteine residues in proteins results in the formation ofWhich of these factors does NOT significantly affect our wellness?A. number of siblingsB. heredityC. environmentD. cultureReaction of the peptide, ala-met-lys-ser, with phenylisothiocyanate (PITC) at pH 8.0 followed by mild acidification (first cycle of Edman method) would release:--the labeled peptide ala-met-lys-ser-PTH.--PTH-ala, PTH-ser, PTH-lys and PTH-met.--PTH-ser and the peptide ala-met-lys.--PTH-ala and the peptide met-lys-ser.--All of the above.Which of the following amino acids occurs most frequently in proteins?methioninealaninetryptophantyrosinehistidineWhich of the following IS NOT a characteristic of a protein's overall conformation?--The overall three-dimensional architecture of the protein.--Achieved by breaking and reforming covalent bonds.--Achieved by rotations about each single bond along the peptide backbone.--The result of amino acid side-chain interactions.--None, all are true.What is the product formed from the acid hydrolysis of a simple amideFibrous proteins, such as collagen, have which one of the following properties?-Highly soluble in water.-Their hydrophilic residues are directed into the interior of the protein.-Exhibit enzymatic activity.-Serve structural roles in the cell.-Monomeric.Hemoglobin is an α2, β2 ____ whereas, glutamine synthetase from E. coli is an α12 ____.All of the information necessary for a protein to achieve its intricate architecture is contained within its --- structureα-Helix and β-strand are components of ____ structureWhich of the following would be a possible amino acid sequence for an oligopeptide given the experimental data below?1.The amino acid composition is found to be [ala, lys, phe, met, cys, plus some decomposition products].2.The peptide has a molecular weight around 700 Da and absorbs at 280 nm.3.Treatment with carboxypeptidase results in tryptophan and a peptide.4.CNBr treatment yields a tetrapeptide and a dipeptide.5.Trypsin digestion produces an amino acid and a pentapeptide with met on the amino end.6.Chymotrypsin digestion yields a dipeptide and a tetrapeptide.All of the statements about the peptide val-asp-trp-asn-ser are correct EXCEPT:This peptide would show a strong absorption band at 280 nm.Reaction with chymotrypsin would yield two peptides.To synthesize this peptide using the solid phase method of Merrifield, the amino acid directly attached to the resin would be valine.After the second round of Edman degradation using the reagent PITC, the PTH-amino acid residue released would be PTH-asp.The peptide would be converted to a dipeptide and a tripeptide by chymotrypsin.Which of the following is not a commonly used technique for protein isolation and purification?-gas-liquid chromatography.-ion exchange chromatography.-electrophoresis.-solubility ("salting in" and "salting out").-affinity chromatography.although they have very different functions, hen egg white lysozyme and -- share similar sequence homology and similar tertiary structure--- Is specific in hydrolyzing only peptide bonds in which the carboxyl function is contributed by an arginine or a lysine residueWhich of the following would not be a useful procedure for dissociating the subunits of a multimeric protein in order to sequence the individual subunits?-Exposure to pH extremes (ie, pH 1 or pH 13).-High salt concentrations.-6 N HCl at 110°C for 24 hours.-8 M urea.-6 M guanidinium chloride.Proteins destined for extracellular location are characteristicallyThe amino acid sequence is NOT:--a distinctive characteristic of a polypeptide.--encoded by the nucleotide sequence of DNA.--a form of genetic information.--read from N-terminal end to C-terminal end.--constant for proteins with the same function from different organisms.the formation of a disulfide bond would be and example of what level of protein sturcterThe advantage of treating separate samples of a protein with two or more enzymes when sequencing a protein is that the products are
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