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Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?
- a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.
- b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.
- c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.
- d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Plants experience periods of anoxia, and the glycolysis-produced pyruv...
Concept:
- Anoxia can be one consequence of waterlogging and submergence of plants. Anoxia in plant tissues reduces the rate of energy production by 65-97% compared with the rate in air.
- Thus, adaptation to anoxia always includes coping with an energy crisis.
- Tolerance to anoxia is relevant to wetland species, rice cultivation and transient waterlogging of other agricultural and horticultural crops.
- Mechanisms of anoxia tolerance in plants is important.
Explanation:
Option 1:
The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.
- this option is not true, as cytosolic pH decreases
Option 2:
The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.
- this option is not true, as cytosolic pHdecreases
Option 3:
The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.
- this option is not true, as cytosolic pH decreases but this results in activation of pyruvate decarboxylase activity.
Option 4:
The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity only.
- In plants, it has been established that anaerobic metabolic pathways other than ethanol production exist.
- First, plants respond to hypoxia/anoxia by producing lactate and the reaction consists of reducing pyruvate by the lactate dehydrogenase (LDH).
- Under prolonged exposure to hypoxia/anoxia, pyruvate is converted to acetaldehyde by pyruvate decarboxylase (PDC), and then the acetaldehyde is converted to ethanol by the acetaldehyde dehydrogenase (LDH).
- The lactate-ethanol transition pathway depends on the initial pH of the cytoplasmic compartment and the lower the pH, the faster this transition occurs because LDH has an optimal alkaline pH of 8.0 while PDC has an optimal acidic pH of 5.8.
- thus this option is true
hence the correct answer is option 4
Most Upvoted Answer
Plants experience periods of anoxia, and the glycolysis-produced pyruv...
Explanation:
Cytosolic pH and Fermentation Flow Shift:
- In periods of anoxia, plants shift from lactate fermentation to ethanol fermentation to aid in survival.
- This shift is influenced by changes in cytosolic pH.
Correct Answer (Option D):
- The cytosolic pH decreases, inhibiting lactate dehydrogenase activity and activating pyruvate decarboxylase activity.
- This results in the flow of fermentation shifting from lactate to ethanol production.
Impact on Enzyme Activity:
- Decreased cytosolic pH inhibits lactate dehydrogenase, the enzyme responsible for lactate fermentation.
- Decreased pH also activates pyruvate decarboxylase, which promotes ethanol fermentation.
Survival Strategy:
- By favoring ethanol fermentation over lactate fermentation, plants can better cope with anoxia and improve their chances of survival.
- This shift in fermentation flow is a crucial adaptation mechanism for plants facing oxygen deprivation.
Cytosolic pH and Fermentation Flow Shift:
- In periods of anoxia, plants shift from lactate fermentation to ethanol fermentation to aid in survival.
- This shift is influenced by changes in cytosolic pH.
Correct Answer (Option D):
- The cytosolic pH decreases, inhibiting lactate dehydrogenase activity and activating pyruvate decarboxylase activity.
- This results in the flow of fermentation shifting from lactate to ethanol production.
Impact on Enzyme Activity:
- Decreased cytosolic pH inhibits lactate dehydrogenase, the enzyme responsible for lactate fermentation.
- Decreased pH also activates pyruvate decarboxylase, which promotes ethanol fermentation.
Survival Strategy:
- By favoring ethanol fermentation over lactate fermentation, plants can better cope with anoxia and improve their chances of survival.
- This shift in fermentation flow is a crucial adaptation mechanism for plants facing oxygen deprivation.
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Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer?
Question Description
Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer?.
Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer?.
Solutions for Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Software Development.
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Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Plants experience periods of anoxia, and the glycolysis-produced pyruvate is initially fermented to lactate. Later stages see an increase in ethanol fermentation and a decrease in lactate fermentation, a phenomenon that aids plant survival in anoxia. Which of the following claims regarding this shift in fermentation flow from lactate to ethanol is true?a)The cytosolic pH increases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.b)The cytosolic pH increases, thus inhibiting lactate dehydrogenase activity and activating pyruvate decarboxy- lase activity.c)The cytosolic pH decreases, thus activating both lactate dehydrogenase and pyruvate decarboxylase activity.d)The cytosolic pH decreases, thus inhibiting lactate dehydrogenase and activating pyruvate decarboxylase activity.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Software Development tests.
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