Answered: When oxygen is not available, yeast…

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?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 11RQ: Which of the following fermentation methods can occur in animal skeletal muscles? a. lactic acid...

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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?

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Which of the following pathways requires molecular oxygen (O2)? a. aerobic respiration b. lactate formation c. alcoholic fermentation d. photosynthesis
What do the electrons added to NAD do? a. They become part of a fermentation pathway. b. They go to another pathway for ATP production. c. They energize the entry of the acetyl group into the citric acid cycle. d. They are converted into NADP.
Which of the following fermentation methods can occur in animal skeletal muscles? a. lactic acid fermentation b. alcohol fermentation c. mixed acid fermentation d. propionic fermentation
Both prokaryotic and eukaryotic organisms carry out some form of glycolysis. How does ha fact support or not support the assertion that glycolysis is one of the oldest metabolic pathways?
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 unavailable, some cells use anaerobic (fermentation) pathways to make ATP. Another textbook says regarding fermentation: "The final steps serve only to regenerate NAD+." What does this statement mean? Explain using examples of specific fermentation pathways.
Fermentation in yeast cells generates ethanol. is this statement true or false?
Is it possible to perform aerobic fermentation using yeast? Explain why and compare the fermentation pathway with anaerobic pathway.
If fermentation is a fast easy way to get ATP without oxygen and without requiring complex organelles, then why is there a slow more complex process involving oxygen?
Just as muscle cells produce lactate/lactic acid as a byproduct of fermentation, yeast cells produce ethanol (an alcohol) as a byproduct of fermentation. If you do not limit the amount of carbohydrate input to a system, how would you expect the rate of fermentation by yeast cells to proceed over time and why.
Yeasts are microorganisms that can perform both aerobic respiration and fermentation. Yeasts can generate nearly 20 times more ATP from glucose using aerobic respiration than fermentation.What is the reason for the big difference in the ATP production of these two metabolic pathways? What environmental condition triggers the shift between these metabolic pathways?
why alcoholic fermentation is not the most efficient process for producing ATP?