Organic Chemistry, Books a la Carte Edition (8th Edition)
Organic Chemistry, Books a la Carte Edition (8th Edition)
8th Edition
ISBN: 9780134074580
Author: Bruice, Paula Yurkanis
Publisher: PEARSON
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Chapter 23, Problem 29P

What acyl groups have we seen transferred by reactions thiamine pyrophosphate as a coenzymes? (Hint: See problems 9, 10, 11, 27, and 28.)

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The dynamic process by which both forms of a- and B-D-glucopyranose in solution change slowly into an equilibrium mixture of both is known as (choose the name). OH OH Но но НО HO OH OH OH OH a-D-glucopyranose 36% B-D-glucopyranose 64% OA Acetylation O B. Enediol Rearrangement OC Mutarotation O D. Acetal Formation O E Epimerization
The vitamin Niacin is used to form nicotinamide adenosine dinucleotide, which readily shuttles between its oxidized (NAD+) and reduced (NADH) forms. The latter serves as a cellular equivalent to NaBH4. The essential portions of the structures are shown below. Outline a mechanism for the cellular conversion of pyruvate to lactate. (Note: like NaBH4, NADH cannot reduce carboxylic acid carbonyls).
4. Liver alcohol dehydrogenase (LADH) catalyzes a reversible, pH-dependent oxidation of an alcohol to an aldehyde according to the following reaction: LADH RCH2OH + NAD* RCHO + NADH + H* where NAD* and NADH are, respectively, the oxidized and reduced forms of the cofactor nicotin-amide adenine dinucleotide. While the reaction is actually a two-substrate reaction, it proceeds like a one- substrate reaction through a so-called compulsory-ordered ternary complex mechanism. It has been shown through kinetic studies that, in the case of primary alcohols, the enzyme binds first the cofactor forming a binary enzyme-NAD* complex that then binds the second substrate, the alcohol, to form a ternary enzyme-NAD*-substrate complex in which the oxidation of the alcohol proceeds with reduction of the cofactor. While the enzyme catalyzes oxidation of various steroids as well as ingested ethanol, it also catalyzes the oxidation of methanol CH3OH, forming the extremely toxic product formaldehyde HCHO.…

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Organic Chemistry, Books a la Carte Edition (8th Edition)

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DIGESTER-35 | VITAMINS AND THEIR RELATED COENZYMES| GPAT | NIPER | PHARMACIST| DI; Author: GPAT DISCUSSION CENTER;https://www.youtube.com/watch?v=CGrdNYmho0s;License: Standard YouTube License, CC-BY