5. (Learning objective 47) Complete the following sentence which tells part of t

Question

5. (Learning objective 47) Complete the following sentence which tells part of the "energy sto for the redox reaction on the right Resazuin In this reaction, electrons move from ontoultimately forming Resorufin. RA A. Resazurin, NADH B. NADH, Resazurin C. Resazurin, NAD D. NAD, Resazurin E. NADH, NAD. Resorufin 6. (Learning Objective 56) Which of the following statements about the yeast fermentation pathway shown below are true? Pyruvate O O decarboxylase Acetaldehyde Ethanol Alcohol #1 H 82 HVNADH+H A. This pathway is important for regenerating the NAD+ pools. B Some yeast will use fermentation even in the presence of oxygen if glucose levels are high enough. C. Since ethanol has not been fully oxidized, it still contains energy. D. Two of the above statements are correct E. A, B, and C are all true statements Below is a shuffled redox tower of a hypothetical electron (Learning objective 61). transport chain for AEROBIC RESPIRATION. Each component of the ETC is numbered on the left. Assume all components are initially in their oxidized 7 0 form. Order these components into a properly functioning ETC such that if the first component in the list were reduced, that it could start a series of electron transfers through each component in the order of your list. Order these components into a properly tunctioning ETC (starting just at the moment NADH donates its electrons). A. 3, 4, 5, 1, 2 1 Cyst (ox) Cyst (red) 0.10 2|Fe-S(ox) |Fe-S (red) 0.12 +0.30 4 NAD +2H NADH +H 0.32 +1.20 -B, 4, 2, 1,3 C. 5, 3, 1, 2, 4 3, 1, 2, 4 4, 2, 1, 3, 5 3 NO +2H NO

Explanation / Answer

5) NADH, Resazurin; In the reaction given, NADH is being oxidise, i.e., electrons is being removed from NADH which leads to reduction of resazurin, i.e., addition of electrons to form Resorufin.

6) Option E, i.e., A, B and C options are correct.

Fermentation by yeast includes glycolysis followed by the conversion of pyruvic acid to ethanol and carbon dioxide and the regeneration of NAD+ from NADH. Ethanol is used as a biofuel because it still retains the capability of being oxidised and thereby provide energy. The phenomenon by which yeast produces ethanol even in presence of oxygen under high glucose concentrations is called Crabtree Effect.

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