People with phenylketonuria suffer brain damage if they consume the amino acid phenylalanine. These individuals also cannot consume the artificial sweetener, aspartame. Using your understanding of biochemistry, explain why people with phenylketonuria cannot consume aspartame. ✓✓✓ NH₂ Phenylalanine OH OH NH₂ Aspartame LOCH3
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- Unbranched homopolymer of N-acetyl glucosamine is : 1.Cellulose 2.Chitin 3.Curcumin 4.Concanavalin AIndividuals with phenylketonuria (PKU) are sensitive to phenylalanine in their diet. Why is a warning on foods containing aspartame (L-aspartyl-l-phenylalanine methyl ester) of concern to individuals with PKU?Which of the following is/are reducing sugar/s?why? A CHOH CHOH CHOH OH OH CHOH OH CH,OH OH OH он C CHOH OH CHOH CHOH HỌ CH2OH OH OH OH OH ÓH u tte Select one: O a. Conly, it is a monosaccharide with a free carbonyl group O b. A and B only, both disaccharides are made from aldoses O C. B, C and D, they have at least one free carbonyl group O d. A and D only, both disaccharides are made from ketosis O. e. B and D, each has a free carboxyl group
- 1.Ala-Phe-Lys-Val-Val-Glu From the above polypeptide, what amino acid/s go/goes inside the cell after the following treatment: Chemotrypsin, thermolysin, then finally pepsin. What protein is left undigested? Write the primary structure of the undigested protein? 2.K-V-F-W-P-L-A-Y a.Chemotrypsin treatment b.Trypsin treatment c.Pepsin treatment d.Thermolysin treatment 3.Total acid hydrolysis of a pentapeptide complemented by total alkalinehydrolysis yields an equimolar mixture of 5 amino acids listed alphabetically, ala-cys,lys,phe,ser. N-terminal analysis with phenylisothiocyanate (PITC) generate PTH-ser. Trypsin digestion produces a tripeptide where N-terminal residue is cys and a dipeptide with ser as its N- terminal.Chemotrypsin digestion of the above tripeptide yields ala plus another dipeptide. A.What is the amino acid sequence of the tripeptide B.What is the amino acid sequence of the dipeptide derived from trypsin digestion? C.What is the primary structure of the original…1. Cysteine is an important amino acid that stabilizes the structure of peptides and proteins by the formation of disulfide bond with another cysteine residue. Illustrate the titrimetric profile of cysteine and calculate its isoelectric pH. [Hint: The sulfhydryl group is titratable] 2. The tripeptide Glu-Pro-Arg (EPR) which is a product of Lactobacillus casei fermentation of milk was found to have potent blood pressure lowering properties. Draw the structure of the tripeptide, give its systematic name, show its titration profile, and determine its isoelectric pH.6. A. List all of the ionizable functional groups that are found in insulin when in aqueous solution. List which amino acid residues have these ionizable groups and list all of the pka and pKb values (including the R groups) that are on both polypeptide chains that make up insulin. (see the table at the end of this HW set; note that tyrosine and cysteine both have unusual pka's, since these side groups ionize above the pKR's given to have a negative charge). B. The isoelectric point of insulin is reported to be around 5.3-5.35. Using the method covered in class, estimate the isoelectric point of insulin and compare your answer to the values above. C. For a polypeptide to be soluble in an aqueous solution, is it good to be near the isoelectric point? Why or why not? Notes: a couple of unusual R group's that ionize (cysteine and tyrosine have R groups that have pka values; histidine has a pkb). The table at the end of this homework set (also in the lecture notes) lists the pka's and…
- Briefly describe the function of uridine triphosphate (UTP) in carbohydratemetabolism.Indicate whether the following pairs of monosaccharides are aldoses or ketoses. a. D-altrose & D-xylose b. D-arabinose & D-glyceraldehyde c. D-erythrulose & D-psicose d. D-talose & D-gulose e. dihydroxyacetone & D-tagatose f. D-idose & D-threoseOH CH OH OH но. CHOH I ACNH "OH CH3 OH HO II но What is the complete name of the monosaccharide unit numbered 1? a-D-N-acetylglucosamine a-D-N-acetylgalactosamine B-D-N-acetylgalactosamine O B-D-N-acetylglucosamine
- N-acetylcysteine is the acetylated form of the amino acid cysteine. N-acetylcysteine can be administered as an antidote to acetaminophen overdose poisoning. HO₂C H₂C. NH S-H A. `N' OH N-acetylcysteine What is the product that we would expect to form through reaction of NAPQI and N- acetylcysteine that would detoxify the reactive metabolite from an acetaminophen overdose? CH3 OH Acetaminophen CO HỌ CH₂ B. FO OH HN- Fo SH CH₂ C. HN HS. i CH₂ D. SH HN CH₂ OModify the structures of D-glucose and D-mannose to show a-D-glucosyl-(1→6)-D-mannosamine. H с H2C ОН с Н ОН Ni/ с ОН Н C I ОН Н 0 Н с CH₂ ОН Н ОН NM! с ジミ Н NH₂ ОН C | Н CCompare and contrast lactose intolerance with galactosemia.(Hint: Make a table.)