Concept explainers
(a)
Interpretation:
The intermediate in the citric acid cycle which contains two chiral centers is to be determined.
Concept Introduction:
The citric acid cycle is a part of
(b)
Interpretation:
The intermediate in the citric acid cycle which contains a secondary alcohol is to be determined.
Concept Introduction:
The citric acid cycle is a part of metabolic pathway can chemically convert carbohydrates, proteins and fats into water and carbon dioxide to generate a form of working energy. Other significant reactions which takes place in this pathway are those which occur in glycolysis and the pyruvate oxidation which occurs before the citric acid cycle and oxidative phosphorylation takes place after it.
Want to see the full answer?
Check out a sample textbook solutionChapter 23 Solutions
General, Organic, and Biological Chemistry - 4th edition
- Fatty acids cannot be converted into carbohydrates in the body as the following reaction is not possible. (A) Conversion of glucose-6-phosphate into glucose (B) Fructose 1,6-bisphosphate to fructose-6-phosphate O(C) Transformation of acetyl CoA to pyruvate (D) Formation of acetyl CoA from fatty acidsarrow_forwardWhat is the product of the reaction when α-amylase acts on amylose? (A) amylose molecules (B) monosaccharide molecules (C) different-sized oligosaccharide fragments (D) different-sized polysaccharide fragmentsarrow_forwardGlucagon secretion increases (A) After a carbohydrate-rich meal (B) After a fat-rich meal (C) When blood glucose is high (D) When blood glucose is lowarrow_forward
- Which process below produces FADH2? The citric acid cycle The conversion of pyruvate Oxidative Phosphorylation O Glycolysisarrow_forwardA portion of the citric acid cycle is shown below. What are the identities of A and B? citrate → A→isocitrate → B A = cis-aconitate; B = a-ketoglutarate A = malate; B = fumarate A = cis-aconitate; B = oxaloacetate A = a-ketoglutarate; B = succinate A = succinate; B = a-ketoglutaratearrow_forwardThe enzyme 6-phosphogluconate dehydrogenase is part of the pentose pathway for glucose oxidation. What enzyme that is involved in glucose oxidation by the citric acid cycle has a very similar reaction mechanism to 6-phosphogluconate dehydrogenase? A) isocitrate dehydrogenase B) alpha-ketoglutarate dehydrogenase C) succinate dehydrogenase D) malate dehydrogenase E) pyruvate dehydrogenase (99+ RATI aarrow_forward
- The image below shows the reactions of the citric acid cycle. Label the reaction types on the diagram. COO CH-OH CH₂ COO 8-5-9-8 HC H₂O NADH +H+ NAD+- FADH2 "7 FAD COO C=O CH₂ COO™ COO CH3-C-COA + H₂O acetyl-CoA COA COO™ Ī CH₂ HỌ—C—COO CH₂ COO™ COO HO-C-H COO™ COO™ CH₂ CH-COO NAD+ NAD+ + COA Attempt 2 NADH + H+ + CO2 NADH + H+ + CO2 COO™ CH₂ CH₂ C=O COO™arrow_forwardThe rate-limiting step is a metabolic pathway is the slowest step which determines the overall rate of the other reactions in the pathway. In glycolysis, the rate limiting step is a phosphorylation reaction where phosphofructokinase (PFK-1) catalyzes the reaction fructose-6-bisphosphate -> fructose-1,6-bisphosphate, the same step in gluconeogenesis. Select one: The statement is FALSE. The statement is TRUE.arrow_forward. Each gram of mammalian skeletal muscle consumes ATP at a rate of about 1x 10-3 mol/min during contraction. Concentrations of ATP and creatine phosphate in muscle are about 4 mM and 25 mM, respectively, and the density of muscle tissue can be taken to be about 1.2 g/cm'. (a) How long could contraction continue using ATP alone? (b) If all creatine phosphate were converted into ATP and utilized as well, how long could contraction continue? (c) What do these answers tell you?arrow_forward
- Acetyl COA (ACC) is a critically important molecule in metabolic pathways. This molecule can be used for gluconeogenesis or fatty acid synthesis. It can also proceed through the TCA cycle to generate energy. ACC is also hormonally regulated. Hormones induce a phosphorylation cascade which can activate or deactivate ACC. Which of these hormones would activate ACC? A) glucagon B) insulin C) epinephrine D) glucose E) testosteronearrow_forwardIdentify the following intermediate in the citric acid cycle, and tell whether it has R or S stereochemistry:arrow_forwardWhat range of concentrations for glucose in blood is considered a normal fasting level?arrow_forward
- Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage LearningGeneral, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage Learning
- Organic And Biological ChemistryChemistryISBN:9781305081079Author:STOKER, H. Stephen (howard Stephen)Publisher:Cengage Learning,