Beer production requires an early period of rapid aerobic metabolismof glucose by yeast. Given that anaerobic conditions are necessary toproduce alcohol, can you explain why this step is necessary?
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Beer production requires an early period of rapid aerobic metabolism
of glucose by yeast. Given that anaerobic conditions are necessary to
produce alcohol, can you explain why this step is necessary?
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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.Fermentation in yeast cells generates ethanol. is this statement true or false?
- Fermentations yield only a fraction of the energy available from the complete combustion of glucose. Why is a relatively inefficient metabolic pathway so extensively used?When oxygen is not available, yeast cells can still do glycolysis to produce ATP. Under these conditions, why would yeast cells also need to do fermentation?Similar to the activity in our muscle cells, certain bacteria canutilize sugars by aerobic cellular respiration (which requiresoxygen) or by fermentation (which does not). However, like musclecells, these bacteria only use fermentation when oxygen is notavailable. Why is aerobic respiration preferable? What is thespecific role of oxygen in this process?
- Pyruvate generated by glycolysis under anaerobic conditions is converted tolactate or ethanol. It may seem this is a waste of energy, but it is in factcritical to survival for cells exposed to oxygen limiting conditions. Explain whythis is true.Is it possible to perform aerobic fermentation using yeast? Explain why and compare the fermentation pathway with anaerobic pathway.which of the following glycolytic reactions is an oxidation? a) G3P to 1,3-BPG b) PEP to Pyr c) lactic acid fermentation under anaerobic conditions d) condensation of acetate with OAA e) succinate decarboxylase reaction
- In aerobic oxidation, oxygen is the ultimate oxidizing agent(electron acceptor). Name two common oxidizing agents inanaerobic fermentation.One of the enzymes involved in glycolysis, aldolase, requires Zn2+ for catalysis. Under conditions of zinc deficiency and the enzyme lacks zinc, it would be referred to as the: a. apoenzyme. b. coenzyme. c. holoenzyme. d. prosthetic group. e. substrate.Fermentation permits the continued extraction of energy from glucose in the absence of oxygen. If glucose catabolism is anaerobic, why is fermentation necessary for glycolysis to continue?