Give the relative rates of reaction of the four carboxylic acid derivatives below with aqueous sodium hydroxide to give the sodium carboxylate salt. CH3 NO2 NO2 H3C H3C H3C H3C a NO2 öror.ordr
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- Dehalogenase enzymes catalyze the clevage of C-X bonds. One such dehalogenase catalyzes the following reaction. An active site aspartate is thought to carry out the initial nucleophilic attack that expels the chloride. Select the most likely intermediate in the reaction. (Note the stereochemistry. Refer to P11.19 in the textbook if needed.) O O A C D OE -CH₂ H H₂C™ CO₂ H B CO₂ CI N H₂O Cr CO₂ H CO₂ нотум CH3 D CO₂ five N E CH₂The concentration ofacetylcholine (a neurotransmitter) in a sample can be determined from the pH changes thataccompany its hydrolysis. When the sample is incubated with the enzymeacetylcholinesterase, acetylcholine is converted to choline and acetic acid, whichdissociates to yield acetate and a hydrogen ion: In a typical analysis, 15 mL of an aqueous solution containing an unknown amount ofacetylcholine had a pH of 7.65. When incubated with acetylcholinesterase, the pH of thesolution decreased to 6.87. Assuming there was no buffer in the assay mixture, determinethe number of moles of acetylcholine in the 15 mL sample.Relate the molecular properties to physicochemical properties of the following lauric acid stearic acid oleic acid methyl laurate methyl oleate a-tocopherol hexadecane cholesterol estrogen
- Identify the conjugate acid-base pairs in the following reactions: HNO2(aq) + H2O(l) → NO2 – (aq) + H3O+(aq) _______ ______ _________ ________ CH3NH2 + H2O(l) → CH3NH3+ + OH – _______ ________ ________ _________Consider the intermolecular forces present in a pure sample of each of the following compounds: CH₃CH₂OH and CH₃COCH₃. Identify the intermolecular forces that these compounds have in common.Shown below is the titration curve for phosphoric acid. At what pH is the solution entirely in the H3PO4 form? 0-0.5 14 12.5 O2.1 NICH
- Consider the following dipeptides: TY SW HF LC LR How many of the dipeptides in this group that would stick to an cation exchange column at pH-8? Please give me the whole number as the answer, 0, 1, 2 etcWrite a sample chemical reaction of chymotrypsin in a complete balanced equation label the following properly: substrate/s, cosubstrate/s, and cofactor/s Show all the changes in the reacting components small molecules should be in their skeletal form large molecules could be shown as hybrid structures - reacting/interacting groups in skeletal form, the rest of the molecule as abbreviations/blocks/shapesThe free energy of hydrolysis for acetic anhydride is221.8 kJ/ mol. The conversion of ATP to ADP also involvesthe cleavage of an anhydride bond. Its free energy of hydrolysis is 230 kJ/ mol. Explain the difference in these values.
- Glycine hydrochloride (Cl− H3N+CH2COOH) is a diprotic acid that contains a carboxylic acid group and an ammonium group and is therefore called an amino acid. It is often used in biochemical buffers. Solve, In analogy with Figure , sketch the titration curve of this diprotic acid.Mixtures of amino acids can be analyzed by first separating the mixture into its components through ion‑exchange chromatography. Amino acids placed on a cation‑exchange resin containing sulfonate (−SO−3)(−SO3−) groups flow down the column at different rates because of two factors that influence their movement: (1) ionic attraction between the sulfonate residues on the column and positively charged functional groups on the amino acids, and (2) aggregation of nonpolar amino acid side chains with the hydrophobic backbone of the polystyrene resin. Note that the ionic attraction is more important than hydrophobicity for this column media. For each pair of amino acids, identify which will be eluted first from a cation‑exchange column using a pH 7.0pH 7.0 buffer.Question 54 Electron transport and chemiosmosis (is the movement of ions across a semipermeable membrane, down their electrochemical gradient.) occur during both aerobic cell respiration and photosynthesis. What is the purpose of electron transport and chemiosmosis in both cell respiration and photosynthesis? O To create sugar molecules from oxygen gas O To create water molecules from carbon dioxide gas OTo use the energy released from slowing electrons to build ATP OTo usc he energy released from slowing electrons to create light