Why does the carbonyl group in aspirin cause stomach bleeding? Talk about the PH & PKa
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Why does the carbonyl group in aspirin cause stomach bleeding?
Talk about the PH & PKa
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- The peptide CMYLES is reacted with phenylisothiocyanate under basic conditions followed by incubation with anhydrous trifluoroacetic acid. What are the products of this reaction? PTH-CMYLES Thiazolinone derivative of cysteine, MYLES O PTH-C, PTH-M, PTH-Y, PTH-L, PTH-E, PTH-S PTH-C, MYLES PTH-S, CMYLEg) (CH3)₂ - CH₂ -CH-COOH + CH₂-CH-COOH -H₂O NH₂ OH NH₂ 4. Write the equation for the digestion (hydrolysis) of Phe-Asp-Ala. €Help filling in the blanks: Pyridoxal phosphate, PLP, is produced from pyridoxine or vitamin B6. PLP is considered a/an [1C/2C/acyl/amino/carboxyl] carrier. In transaminases, PLP forms a [Schiff base/acetal/phosphoanhydride/condensation] with an amino acid and causes the [a- amino/a-carbon/a-carboxyl] to become [electrophilic/nucleophilic] allowing replacement of the amino group on the amino acid with a ketone. PLP is also used by several other enzymes that work on amino acids because in forming a covalent bond with amino acids it provides for an opportunity for nucleophilic attack and because PLP is conjugated, the cofactor is able to [delocalize/transfer/reduce/stabilize] pi electrons in the substrate and thus [stabilize/delocalize/transfer/reduce] the transition state of the reaction. Production of citrulline occurs in the [cytosol/mitochondrial matrix] while the rest of the urea cycle occurs in the [cytosol/mitochondrial matrix]. Urea is produced in the…
- Amino acids can be prepared from a-halo carboxylic acids [RCH(X)COOH] by reaction with excess NH3. Why is excess NH3 needed for this reaction?Consider the each of the amino acids in the peptide below. Ala-Ile-Asp-Arg-Gln-Gly-Pro-Gly-Ala-Tyr-Val-Ile-Gln-Leu If all of the amino acids are degraded to yield energy (ATP), explain how many Acetyl CoAs for oxidation to CO2 could be produced from this peptide. note: Do not make glucose at the beginning, however converting the TCA intermediates into molecules in the glycolytic pathway for optimal Acetyl CoA production is allowed. Be sure to show clearly which pathway will the Acetyl CoA enter (to yield ATP ultimately) under such conditionwhat is the value of glycine pKa of nh3 group
- Which of the following statements is not true about the catalytic triad in chymotrypsin? Group of answer choices the side chain of the serine 195 is hydrogen bonded to the imidazole ring of histidine the -NH group of the imidazole ring of histidine is hydrogen bonded to the carboxylate group of aspartate 102 the histidine residue serves to position the aspartate 102 side chain and to polarize its carboxylate group so that it is poised for deprotonation histidine acts as a general base catalyst none of theseY,G,I,F,L,Y what is the biochemical propities of this residues.The chemical structure of Coenzyme A contains the following EXCEPT— a β-mercaptoethylamine residue. a phosphoanhydride moiety. an adenosine-3’- phosphate. a pantothenic acid residue. a lipoic acid residue.
- If phenylalanine was not an essential amino acid, would diet therapy (the elimination of phenylalanine from the diet) for PKU work?The structure of aspartame, is shown in the following diagram. Label the functional groups. H. H2N- C N. CH OCH3 CH2 CH2 COOH aspartame O=UWe want to measure the activity of alanine aminotransferase (ALAT) present in a serum. The reaction catalyzed by the enzyme is: Reaction 1: +H3N- glutamate H C CH₂ CH₂ COO -COO + pyruvate CH3 C=0 0.1 M phosphate buffer pH 7.4 : 550 µL 1.2 M alanine : 100 μL CH3 time (min) A340 COO COO™ pyruvate lactate dehydrogenase* (LDH, 300 µg.mL-¹): 50 μL 1.5 mM NADH: 200 μL 0.04 M a-ketoglutarate: 500 μL serum containing ALAT: 600 μL The enzyme reaction is realized in the following conditions: In a 1 cm-cuvette are added: 0 0.915 ALAT NADH + H+ LDH a-cétoglutarate COO * Lactate dehydrogenase (LDH) reduces pyruvate into lactate, with the concomitant oxydation of NADH. This allows to indirectly measure the amount of product formed. Reaction 2: NAD+ 1 0.741 C=O H CH₂ CH₂ COO™ CH3 C-OH COO lactate The reaction is performed at 25 °C and the absorbance at 340 nm is monitored every minute, for 5 min. The absorbance values are given in the table below: Data: alanine ENADH at 340 nm = 6220 M¹.cm1. One…
