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Concept explainers
(a)
Interpretation:
Among acyl CoA, enoyl CoA, hydroxyacyl CoA, or ketoacyl CoA, the substance that is involved as a product in step 1 of one “turn” of the β-oxidation pathway has to be determined.
Concept introduction:
The β-oxidation pathway is defined as a repetitive series of four biochemical reactions in which acyl CoA is degraded to acetyl CoA by the removal of two carbon atoms at a time. NADH and FADH2 are also produced in this pathway. The
A product is defined as the substance that is formed after the completion of a
(b)
Interpretation:
Among acyl CoA, enoyl CoA, hydroxyacyl CoA, or ketoacyl CoA, the substance that is involved as a reactant in step 2 of one “turn” of the β-oxidation pathway has to be determined.
Concept introduction:
The β-oxidation pathway is defined as a repetitive series of four biochemical reactions in which acyl CoA is degraded to acetyl CoA by the removal of two carbon atoms at a time. NADH and FADH2 are also produced in this pathway. The functional group change in the β-oxidation pathway is as follows:
A reactant is defined as the substance that is initially present in the chemical reaction and gets consumed to form a new substance.
(c)
Interpretation:
Among acyl CoA, enoyl CoA, hydroxyacyl CoA, or ketoacyl CoA, the substance that is involved as a reactant in step3 of one “turn” of the β-oxidation pathway has to be determined.
Concept introduction:
The β-oxidation pathway is defined as a repetitive series of four biochemical reactions in which acyl CoA is degraded to acetyl CoA by the removal of two carbon atoms at a time. NADH and FADH2 are also produced in this pathway. The functional group change in the β-oxidation pathway is as follows:
A reactant is defined as the substance that is initially present in the chemical reaction and gets consumed to form a new substance.
(d)
Interpretation:
Among acyl CoA, enoyl CoA, hydroxyacyl CoA, or ketoacyl CoA, the substance that is involved as a product in step 4 of one “turn” of the β-oxidation pathway has to be determined.
Concept introduction:
The β-oxidation pathway is defined as a repetitive series of four biochemical reactions in which acyl CoA is degraded to acetyl CoA by the removal of two carbon atoms at a time. NADH and FADH2 are also produced in this pathway. The functional group change in the β-oxidation pathway is as follows:
A product is defined as the substance that is formed after the completion of a chemical reaction.
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Chapter 25 Solutions
EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- Identify different types of organic reaction mechanism (SN1, SN2, etc.) and reaction types (Addition, elimination, etc ) in the following metabolic pathways. 1. Conversion of Pyruvate to Acetyl CoA 2. Citric acid cycle 3. Gluconeogenesis pathway (pyruvate to glucose)arrow_forwardWhich of the following statements is/are TRUE for the Krebs' cycle? Reaction 1: condensation of acetyl-CoA and oxaloacetate; produces H20. Reaction 3: oxidation of isocitrate to a-ketoglutarate; produces NADH and CO2. Reaction 6: oxidation of succinate to fumarate; produces FADH2 and CO2 Reaction 5: hydrolysis of succinyl-CoA to succinate; produces ATP.arrow_forwardcoo- 21 CH2 316 НО-С-СОО- HOC COO- 4 CH2 | 5, °coo-arrow_forward
- The sources of the three (3) carbons in malonyl-Coa is/are: a. 1 C from C02 and 2 C from acetyl-CoA b. 1 C from HCO3- and 2 C from acetyl-CoA c. 1 C from biotin and 2 C from acetyl-CoA d. All three C from acetyl-CoAarrow_forwardThe citric acid cycle is shown. The methyl carbon in acetyl CoA is labeled with C14C14 (shown in red). Identify which of the carbons in each intermediate will be labeled in the first round of the cycle by selecting the indicated carbon(s). Each question has multiple options, answering with only one option is incorrect. Which carbon(s) in α‑ketoglutarate will contain C14? 1 2 3 4 5 Which carbon(s) in succinyl‑CoA will contain C14? 1 2 3 4 Which carbon(s) in succinate will contain C14? 1 2 3 4 Which carbon(s) in fumarate will contain C14? 1 2 3 4 Which carbon(s) in malate will contain C14? 1 2 3 4 Which carbon(s) in oxaloacetate will contain C14? 1 2 3 4arrow_forwardThe following reaction is a vitamin B12-dependent reaction that proceeds via a mechanism analogous to that of the methylmalonyl-CoA mutase reaction. H Н4 H 1 H3N 2 H `H H HO b H H5 Identify which atoms in the product(s) correspond to the numbered atoms in the reactant. Atom a corresponds to atom Atom b corresponds to atom Atom c corresponds to atomarrow_forward
- The citric acid cycle is shown. The methyl carbon in acetyl CoA is labeled with C14C14 (shown in red). Identify which of the carbons in each intermediate will be labeled in the first round of the cycle by selecting the indicated carbon(s). Each question has multiple options, please choose more than one. Which carbon(s) in α‑ketoglutarate will contain C14? 1 2 3 4 5 Which carbon(s) in succinyl‑CoA will contain C14? 1 2 3 4 Which carbon(s) in succinate will contain C14? 1 2 3 4 Which carbon(s) in fumarate will contain C14? 1 2 3 4 Which carbon(s) in malate will contain C14? 1 2 3 4 Which carbon(s) in oxaloacetate will contain C14? 1 2 3 4arrow_forwardMost fatty acids have an even number of carbons and, therefore, are completely metabolized to acetyl-CoA. A fatty acid with an odd number of carbonsis metabolized to acetyl-CoA and one equivalent of propionyl-CoA. The following two reactions convert propionyl-CoA into succinyl-CoA, a citric acidcycle intermediate, so it can be further metabolized. Each of the reactions requires a coenzyme. Identify the coenzyme for each step. From what vitaminsare the coenzymes derived? (Hint: see Chapter 23.) COO− COO−CH2CH2methylmalonyl-CoA succinyl-CoA CH3CH2 SCoAarrow_forwardFatty acids are converted to their coenzyme A esters in a reversible reaction catalyzed by acyl-CoA synthetase: R-COO +ATP +COA R-C-COA +AMP + PPi a) The reaction involves two steps the first of which forms an enzyme-bound intermediate identified as the mixed anhydride of the fatty acid and AMP: R-C-O-P-O-nibose-adenine Write two chemical equations coresponding to the two steps of the reaction catalyzed by the synthetase. b) The acyl-CoA synthetase reaction as written above is readily reversible. How might the reaction be made to favor formation of fatty acyl-CoA? Write within the box. Anything outside the box will not be graded. From thearrow_forward
- D) Carbohydrate catabolism involves substrate-level phosphorylation. E) My answer is not here 27. The adduct acetoacetyl-acyl carrier protein is formed as an intermediate during fatty acid biosynthesis. The CO2 used to synthesize malonyl-S-CoA is lost. Would this help make the reaction more or less energetically favorable? A) Loss of CO2 increases entropy (AS) and therefore decreases the favorability of the reaction (AG). B) Loss of CO2 has no effect on entropy (AS) and therefore does not affect the favorability of the reaction (AG). C) Loss of CO2 increases entropy (AS) and therefore increases the favorability of the reaction (AG). D) Loss of CO2 decreases entropy (AS) and therefore decreases the favorability of the reaction (AG). E) Loss of CO2 decreases entropy (AS) and therefore increases the favorability of the reaction (AG).arrow_forwardThe immediate precursor to acetyl–CoA from glycolysis is pyruvate.a) Write the pathway (not the mechanism) for the series of steps for this conversion. Includestructures for all coenzymes and reactants for each step.b) Discuss the mechanistic advantages offered by this multienzyme complex. Be specific and giveexamples.c) The last step of the reaction, catalyzed by enzyme 3, includes three coenzymes and oxidation.Write the mechanism for this enzyme.arrow_forwardFatty acid synthesis requires the activation of acetyl CoA to malonyl CoA. However, its condensation with a fatty acyl ACP results in the addition of only its two carbons. What is the thermodynamic advantage of the activation reaction? . The condensing enzyme requires a 3-carbon compound as substrate. Cleavage of CO2 from malonyl CoA provides the energy to allow for condensation to occur. It is the activate form of the two carbon acetyl CoA necessary for condensation. It makes malonyl CoA unstable. The reaction is a reversal of the 2-oxidation which is a spontaneous process.arrow_forward
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