16. Which of the following statements is true for the shown reaction?C-S-COACH₂H₂C-C-OHCH₂COOSCH3-C-S-COACooICH₂IC=0CH3PA. The reaction occurs in the muscleB. The reaction occurs during ß-oxidationC. To be transported through the blood stream, P needs to associate with albumenD. P can be easily converted to glucoseE. All of the aboveF. None of the above

Acetyl CoA produced from fatty acid oxidation in the hepatic cells has two possible fates:enter TCA…

Answered: 16. Which of the following statements…

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter25: Nitrogen Acquisition And Amino Acid Metabolism

Section: Chapter Questions

Problem 20P: Consider the synthesis and degradation of tyrosine as shown in Figures 25.37, 25.38, and 25.48 to...

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17. The shown reaction is one of the four repeating steps during fatty acid ß-oxidation. Which of the following statements is correct for the shown reaction? CH₂- I -C- 1. HO H A -S-COA B _-1-5-8²-5-co Н2 s-CoA A. The small molecule in box A is FAD B. It is the second oxidation reaction during ß-oxidation C. Both A and B D. Neither A nor B
One of the steps in psilocybin biosynthesis is the phosphorylation of 4-hydroxytryptamine By the enzyme Psik as shown below, that involves the hydrolysis of ATP. NH₂ OH HO Psik HO of A& ADP 4-hydroxytryptamine ATP norbaeocystin The standard free energy changes for each reaction is shown in the Table below. J reaction 4-hydroxytryptamine + P₁ → norbaeocystin ATP → ADP+ Pi (b) What is the equilibrium constant at 37 °C? AG 27.7 kJ/mol -32.2 kJ/mol (a) Write the net reaction. What is the standard free energy change for the net reaction? (c) In the cell, the concentration of ATP is 3.1 mM, the concentration of P; Is 5.90 mM, and the Concentration of ADP is 220 μM. What will AG Be if the concentration of norbaeocystin Is always kept at 1/100 of the concentration of 4-hydroxytryptamine?
Which cytochrome P450-catalyzed reaction is shown below? R-CH2NH2 [R-CH=NH] Oxidation of aromatic amines Oxidative deamination Oxidative O-dealkylation Oxidative N-dealkylation para-hydroxylation R-CHO + NH3
Which statement on the biosynthesis of cannabinoids is NOT TRUE? Select one: O a. Geranyl pyrophosphate is formed as a precursor via the deoxyxylulose pathway in cannabis O b. Divarinic acid is the precursor for the production of propyl cannabinoid acids. O C. When prenyl-transferase enzyme uses olivetolic acid as substrate cannabigerivarinic acid (CBGVA) is formed. O d. THCA-synthase, CBDA-synthase, and CBC- synthase enzymes can use both CBGA and GBGVA as substrate.
19. Which of the following statements is true for the shown reactions? i C-S-COA CH₂ H₂C-C-OH CH₂ coo W Coo CH₂ C=0 I Acetyl-CoA CH3 x 214 Coo- 1 CH ₂ I CHOH CH3 Y A. Deficiency of oxaloacetate stimulates the formation of X and y B. Insulin signaling stimulates the formation of X and Y C. Both A and B D. Neither A nor B
Allosteric inhibitors of hemoglobin will decrease enzyme activity (oxygen binding) through which of the following mechanisms? Binding the enzyme in "T" conformation and displacing an activator Binding the enzyme and enhancing the Vmax Binding the enzyme, and keeping it in the "R" conformation Binding the enzyme, and keeping it in the "T" conformation
Dehydratase is a PLP-requiring enzyme that catalyzes an a,b-elimination reaction. Propose a mechanism for this reaction. dehydratasePLP +NH3O OO O− HO O− + NH4
Give the product of this reaction sequence: NH3* Bg-CH3 Bg SH (cobalamin) Adenosyl-S H₂C-NH OH A Adenosyl-O intermediate D HN-CH3 Adenosyl-NH HS SH B ATP O-CH3 PPP₁ H3C-S+ Adenosyl H₂N E Adenosyl-O product OH с NH₂ S-CH3
8. The enzyme thiolase catalyzes one step in the ß-oxidation of saturated fats. One portion of the mechanism for this reaction is shown below. Describe the catalytic mechanism at work. (Note: "SCOA" is shorthand for the compound Acetyl-CoA) RCOCH₂COSCoA + HSCOA → H3C₂OSC0A + RCOSCOA HN NH CH₂ NH CH₂ CH₂ FS Grease NH3 H-SCO A NH CH2 CH₂ NH3 S Co A CH₂ NH 1 3 H-SCO A H3C SCO A NH3 a h-SCOA R-C S Co A CH₂ CH₂ C H₂ 0=0 HN NH + NH3 H₂C HN CH₂ NH CH₂ CH₂ 2 S Co A CH₂ NH NH
4. Different B-latamases employ different mechanisms in catalyzing the hydrolysis of B-lactam ring. PHCH2CONH PHCH,CONH .S H20 B-lactamase čo, Two mechanisms have been proposed as below. (Mechanism A) Asp90 Asp90 NH. Asp90 Asp90 ---O-H (Mechanism B) Asp 90 Asp 90 NH- HO. Asp 90 (a) Briefly discuss the roles that the Zn* ion plays in the first and second step of Mechanism A. (b) Discuss the different roles of Asp90 in the two mechanisms.
1. Consider the reaction: succinyl-CoA succinate H3C C H₂ a. What kind of reaction is being performed here? H³C C H₂ b. What enzyme performs this reaction? S-COA c. What cofactors, if any, are required for this reaction?
33. Which of the following statements is true for the shown reaction? P-O-CH₂ P-O-CH₂ OH A Coo I C=O HOTHS CH₂ Coo A HỌ он D A. The reaction is catalyzed by PFK-1 B. Stimulation of the reaction eventually slows down gluconeogenesis C. Inhibition of glyceraldehyde 3-phopshate dehydrogenase leads to the accumulation of the product B D. All of the above E. None of the above OH 34. Which of the following statements is true for the shown reaction? COO™ CH₂OH HQ -℗ B CH₂ B C-o-℗ + CO₂ A. Insulin can eventually inhibit the reaction B. The reaction only take place in the presence of acetyl-CoA C. The product B is a high-energy molecule, and the next logical step is to use the energy released from B to synthesize ATP D. All of above E. None of the above

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