Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 29.SE, Problem 51AP
In glycerol
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Draw the Fischer projection of the product of the reaction of D-
glyceraldehyde-3-phosphate catalyzed by glyceraldehyde-3-phosphate-
dehydrogenase in this step in glycolysis. Provide the structure in the
protonation state found in physiological conditions.
H
OH
OPO2-
H
Drawing
。
glyceraldehyde-3-
phosophate
dehydrogenase
NAD+, Pi
NADH
Cholesterol-lowering drugs commonly target
O HMG-COA synthase, the enzyme that catalyzes the synthesis of mevalonate
O pyruvate decarboxylase complex, which catalyzes the synthesis of acetyl-CoA
O mevalonate, an isoprene
O HMG-COAreductase, the rate-limiting enzyme in cholesterol biosynthesis
O HMG-CoA synthase, the enzyme that catalyzes the first step in cholesterol biosynthesis
Step 7 of the citric acid cycle is shown. Which statement best describes what occurs
in this step?
CO₂
1
CH
||
CH
+ H₂O
CO₂
fumarate
CO₂™
fumarase HO C-H
CH₂
CO₂
malate
A)
Fumarate undergoes hydrogenation with hydrogens and electrons provided
by the enzyme fumarase.
B) Fumarate undergoes hydration with the aid of the enzyme fumarase.
C) Fumarate undergoes hydrolysis with the aid of the enzyme fumarase.
D) Fumarate undergoes reduction with the aid of the cofactor fumarase.
Chapter 29 Solutions
Organic Chemistry
Ch. 29.1 - Prob. 1PCh. 29.3 - Write the equations for the remaining passages of...Ch. 29.3 - Prob. 3PCh. 29.4 - Write a mechanism for the dehydration reaction of...Ch. 29.4 - Evidence for the role of acetate in fatty-acid...Ch. 29.4 - Does the reduction of acetoacetyl ACP in step 6...Ch. 29.5 - Prob. 7PCh. 29.5 - Look at the entire glycolysis pathway, and make a...Ch. 29.6 - Prob. 9PCh. 29.7 - Prob. 10P
Ch. 29.7 - Write mechanisms for step 2 of the citric acid...Ch. 29.7 - Prob. 12PCh. 29.8 - Prob. 13PCh. 29.9 - Write all the steps in the transamination reaction...Ch. 29.9 - What -keto acid is formed on transamination of...Ch. 29.9 - Prob. 16PCh. 29.SE - Prob. 17VCCh. 29.SE - Identify the following intermediate in the citric...Ch. 29.SE - The following compound is an intermediate in the...Ch. 29.SE - Prob. 20VCCh. 29.SE - In the pentose phosphate pathway for degrading...Ch. 29.SE - Prob. 22MPCh. 29.SE - One of the steps in the pentose phosphate pathway...Ch. 29.SE - One of the steps in the pentose phosphate pathway...Ch. 29.SE - Prob. 25MPCh. 29.SE - Prob. 26MPCh. 29.SE - Prob. 27MPCh. 29.SE - Prob. 28MPCh. 29.SE - Prob. 29MPCh. 29.SE - Prob. 30MPCh. 29.SE - Prob. 31MPCh. 29.SE - Prob. 32APCh. 29.SE - Prob. 33APCh. 29.SE - Prob. 34APCh. 29.SE - Prob. 35APCh. 29.SE - Prob. 36APCh. 29.SE - Prob. 37APCh. 29.SE - Prob. 38APCh. 29.SE - Prob. 39APCh. 29.SE - Prob. 40APCh. 29.SE - Prob. 41APCh. 29.SE - Prob. 42APCh. 29.SE - Prob. 43APCh. 29.SE - Prob. 44APCh. 29.SE - Prob. 45APCh. 29.SE - Prob. 46APCh. 29.SE - Prob. 47APCh. 29.SE - Prob. 48APCh. 29.SE - Prob. 49APCh. 29.SE - Prob. 50APCh. 29.SE - In glycerol metabolism, the oxidation of...Ch. 29.SE - Prob. 52APCh. 29.SE - Prob. 53APCh. 29.SE - Prob. 54APCh. 29.SE - In step 7 of fatty-acid biosynthesis (Figure...Ch. 29.SE - Prob. 56AP
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- TPP is a coenzyme for transketolase, the enzyme that catalyzes the conversion of a ketopentose (xylulose5-phosphate) and an aldopentose (ribose-5-phosphate) to an aldotriose (glyceraldehyde-3-phosphate) and a ketoheptose (sedoheptulose-7-phosphate). Notice that the total number of carbons in the reactants and products is the same (5 + 5 = 3 + 7). Propose a mechanism for this reaction.arrow_forwardThe same E1–E2–E3 multienzyme structure found in the pyruvate dehydrogenase and the a-ketoglutarate dehydrogenase complexes is also used in the branched-chain a-ketoacid dehydrogenase complex, which participates in the catabolism of branched-chain amino acids. Draw the reaction product when the following substrate is acted on by the branched-chain a-keto acid dehydrogenase complex.arrow_forwardH-C-U-o 27. The following is step 3 of the citric acid cycle. What is the functional transformation that occurs in the first part of this step? group COO COO NAD* NADH + H* CH2 CH2 0 H-C-C CH2 H-C-H H-C-COO- Но-с-н COO COO Isocitrate a-ketoglutarate A) A ketone and an alcohol change positions. C) The -COO is transformed. B) An alcohol becomes a ketone. D) The alcohol becomes an aldehyde. 28. The following is step 3 of the citric acid cycle. What is the identity of the Molecule represented by I? COO COO NAD* NADH + H* I COO CH2 CH2 0 H-C-C CH2 H-C-H H-C-COO- HO-C-H COO COO Isocitrate a-ketoglutarate A) Acetate B) GTP C) NADH D) FADH2 E) CO2arrow_forward
- If an enzyme-catalyzed reaction has a high rate at low pH and low rate at higher pH, this implies that a group on either the enzyme or the substrate must be for an efficient reaction. leaving group oxidoreductase coenzymes O protonated deprotonated The compound that consists of deoxyribose linked by an N-glycosidic bond to N-9 of guanine is: adenylate deoxyguanosine guanosine nucleotide guanylatearrow_forwardSelective and specific inhibitors of acetyl-CoA carboxylase have been proposed to be potential anti-obesity drugs. (i) What is the effect of an inhibitor of acetyl-CoA carboxylase on fatty acid synthesis and fatty acid oxidation? Figure 5 shows the structures of the inhibitors of acetyl-CoA carboxylase: CABI-COA and CABI. What structural features of CABI make it a potential inhibitor of acetyl-CoA carboxylase?arrow_forwardwhat is the mechnism of it?arrow_forward
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