Which of the following features of a reaction suggest that it could be a reaction common to both glycolysis and gluconeogenesis? CIRCLE the letter for each relevant feature and give a brief (10 words or less) explanation of why you selected that feature.
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- Based on your residing of this chapter, what would you expect to be the most immediate effect oil glycolysis, if the steady-state concentration of gJucose-6-P were 8.3 mM instead of 0.083 mM?Based on your knowledge of the structure of NAD+ and an assumption that coenzyme dissociation is the rate limiting step of the alcohol dehydrogenase mechanism, hypothesize why a N249W mutation at the coenzyme binding site would increase the rate of catalysis.What is the significance of the ΔG°’ value of each step of Glycolysis? Why do some values classify reactions as irreversible and others as easily reversible?
- In relation to Carbamoyl Phosphate Synthetase enzyme, answer the following: A- What are the two isoforms of this enzyme, explain why there are two isoforms? B- What are the clinical manifestations associated with the deficiency of these two enzymes? C- Write down the biochemical reaction and the name of the metabolic pathway that these two isoforms are involved in, and how many ATP is utilized by these two isoforms?What if the phosphate group for the glycolysis reaction with enzyme glyceraldehyde 3-phosphate dehydrogenase was from ATP instead of Pi? What would the complete, balanced, net rxn of glycoslysisequation be and how does this impact the overall glycolysis rxn?The reaction catalyzed by glyceraldehyde 3-phosphate dehydrogenase involves two "sub-reactions", one of which is unfavourable. How is the energy barrier of this unfavourable sub reaction overcome? A. through the formation and hydrolysis of a thioester bond using a cysteine molecule in the enzyme B. through the hydrolysis of an ATP molecule C. through the hydrolysis of a thioester bond in the substrate molecule D. the enzyme catalyzes the formation of a thioester bond E. none of these explanations describe how the energy barrier is overcome Please answer asap
- In Bacillus subtilis, threonine is metabolized by the following sequence of reactions: (a) oxidation; (b) decarboxylation;(c) transamination; and (d) oxidation to produce pyruvate. Outline this sequence of steps, show the structures of thesubstances, use abbreviations for the cofactors, and show any enzyme-bound coenzymes. What type of enzyme bound intermediate is likely for reaction (d)?With regard to the glyceraldehyde-3-phosphate dehydrogenase enzyme reaction:a) Write the mechanism of the reaction.b) What two enzyme intermediates are involved? One undergoes an oxidation-reduction step.What is oxidized and what is reduced? How are the electrons transferred? The secondintermediate has some different chemistry than usual esters. Comment.c) What factors are operating here to bring about the catalysis that this enzyme carries out?d) The product of this reaction is “rather special”. CommentIn the living cell, free energy made from one reaction can be used to drive another in an energetically unfavorable direction, provided the two reactions have a common intermediate (this is termed the principle of common intermediates). Example: In glycolysis, glucose is converted into pyruvate; in gluconeogenesis, pyruvate is converted into glucose. However, the actual ΔG for the formation of pyruvate from glucose is about -84 kJ/mol under typical cellular conditions. Most of the decrease in free energy in glycolysis takes place in three essentially irreversible steps catalyzed by, hexokinase, pyruvate kinase and phosphofructokinase. Use one of the 3 opposing reactions (in glycolysis and gluconeogenesis) to demonstrate the PRINCIPLE OF COMMON INTERMEDIATES
- Anabolic reactions like fatty acid synthesis are inherently endergonic and require exergonic driving forces to proceed forward. Which of the following statements correctly describes the thermodynamics at play in the substrate activation step of fatty acid synthesis and the importance of this step in downstream elongation of the fatty acid chain? (A) Acetyl CoA carboxylase (ACC1) provides free energy that powers the carboxylation of acetyl CoA to form malonyl CoA.(B) The formation of malonyl CoA is powered by the exergonic carboxylation of acetyl CoA.(C) The formation of a b-ketoacyl ACP in the first step of fatty acid synthesis is driven forward because b-ketoacyl synthase hydrolyzes ATP. (D) The addition of two carbons to the growing fatty acid chain is powered by malonyl ACP decarboxylation.(E) Decarboxylation of malonyl ACP is exergonic and the free energy that is released is coupled to ATP synthesis.Starting with pyruvate (CH3COCOO—) as the precursor, the first step of gluconeogenesis is activation of pyruvate. Show the reaction for activation of pyruvate. Name the enzyme and coenzyme for this reaction. Why is the activation step necessary? What is the next step after the activation step?Write the ten reactions of the glycolytic pathway, naming all enzymes and providing the structural formulas of their substrates and products.