1. Why are anabolic reactions that require energy always linked with the hydrolysis of a high energy compound like ATP? 2. Why is the conversion of NAD+ to NADH and H+ a reduction?
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- 11. Refer to the figure below. нн Н `NH2 NH2 N' N- 2e-+H* R NAD+ NADH NAD+ functions as a coenzyme in many enzyme-catalyzed reactions. The changes that take place in this coenzyme are the same for all of these reactions and are illustrated in the figure. It is likely that, in these reactions, NAD+ functions as an electron acceptor (reducing agent) in redox reactions. functions as an electron donor (oxidizing agent) in redox reactions. functions as a base in acid-base catalytic mechanisms. functions as an electron donor (oxidizing agent) in redox reactions. functions as an electron acceptor (oxidizing agent) in redox reactions. +Z-1. True / False: NADH dehydrogenase is the least electronegative complex of the ETC. 2. True / False: Most of the energy lost during the conversion of one form to another is as light. 3. True / False: The addition of a phosphate group is called phosphorylation. 4. True / False: The ETC pumps protons into the mitochondrial matrix. 5. True / False: FADH₂ transfers its electrons directly to cytochrome c. 6. True / False: FADH₂ is created exclusively during the citric acid cycle. 7. True/False: Alcohol fermentation occurs most commonly in animals and plants. 8. True / False: During fermentation, NAD* is regenerated when NADH is reduced. 9. True / False: The hydrolysis of ATP releases free energy. 10. True / False: Most of the CO₂ produced by cellular respiration is formed during ETC/chemiosmosis.6. Fill in the blanks and select the correct option [A/B/C] in the paragraph below. Although both NADH and FADH₂ bring high-energy electrons to the ETC, ultimately they produce different amounts of [ H₂O / ATP /0₂]. NADH is [oxidized / reduced] by NADH reductase resulting in 2 H*/protons being pumped from the to the [2/4/6] FADH₂ gives its electrons to [ ubiquinone / cytochrome c] which means that only [2/4/6] H*/protons are pumped. All electrons are eventually accepted by which produces water/H₂O. Ultimately, each NADH is responsible for the production of about [2/3 /4] ATP while FADH₂ makes [2/3/4] when the potential energy of the electrochemical gradient moves [ protons/electrons ] back into the matrix using the enzyme
- 1. When combined with the electron transport chain, ONE turn of the citric acid cycle produces ___________ATP. The citric acid cycle is shown below. 2. When all the NADH coenzymes generated from ONE turn of the citric acid cycle enter the electron transport chain, how many ATP molecules are produced?12. Which of the following statement about coenzymes is not correct? The adenosine monophosphate component of NAD+ does not participate in the redox reaction. Ubiquinones such as coenzyme Q can be reduced in two steps involving one electron each. The flavins can transfer or take up electrons in single-electron steps but they are not able to undergo two-electron reductions. The oxidation of glucose is coupled to the generation of both NADH and FADH2. The 2’ hydroxyl group of the AMP portion of NAD+/NADH can be phosphorylated to become NADP+/NADPH.3. Answer the following questions about the metabolic pathway shown below: glutamate dehydrogenase e NH3 0-C-C-cH2-CH2-C- 0-C-CH-CH2-CH2-C-O + H,O + NAD + NH + NADH + H (a) Label the correct substances as the substrate, enzyme, and co-enzyme. (b) Which of the six classes does the enzyme of this reaction belong to? Why? (c) What is the name of the first molecule in this reaction? (d) Which metabolic pathway is this reaction likely to be a part of? A. glycolysis B. deamination C. beta-oxidation D. fermentation
- 22. Which pathway will result in the production of four carbon dioxide molecules, two ATP molecules, NADH2 and FADH2? Group of answer choices oxidative phosphorylation Krebs cycle glycolysis pyruvate oxidation1. What is the function of molecules like NAD+/NADH and FAD/FADH2 in cells? 2. Why is the Krebs cycle important in both catabolism and anabolism?1 what is the common intermediary in the catabolism of carbohydrates, proteins and lipids? 2 What cyclic pathway doe sthis common metabolite enter? 3 what are the roles of NAD+ and FAD in metabolism 4 what are the reduced forms of NAD+ and FAD? 5 what are the entry point for the reduced forms of NAD+ and FAD in the electron transport chain?
- 17. Which of the following chemical formula summarizes cellular respiration? Group of answer choices 6CO2 + 6O2 + light energy 6H2O + C6H12O6 6CO2 + 6H2O + light energy C6H12O6 + 6O2 C6H12O6 + 6O2 6CO2 + 6H2O + ATP C6H12O6 + 6H2O 6O2 + 6CO2 + ATP16. Describe how each of the following compounds participate in energy metabolism.a) Pyruvic acid b) NAD +1. Name the metabolic process 2. Name the stage of metabolism this gas is involved in 3. Describe exactly how is it involved 4. The redox of the reaction 1) Why do humans breath in O2? Why do humans breath out CO2? Why do plants take in CO2? Why do plants take in H2O? Why do plants give off O2?