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When fats are the respiratory substrate, the value of RQ would be- a)Approx. 0.7
- b)Approx. 1.0
- c)More than 1.0
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
When fats are the respiratory substrate, the value of RQ would be
a)
Approx. 0.7
b)
Approx. 1.0
c)
More than 1.0
d)
None of the above
 | Surbhi Mishra answered |
Ans.
The respiratory quotient (or RQ or respiratory coefficient), is a dimensionless number used in calculations of basal metabolic rate (BMR) when estimated from carbon dioxide production. ... If metabolism consists solely of lipids, the Respiratory Quotient is 0.7, for proteins it is 0.8, and for carbohydrates it is 1.0.
The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of- a)Nucleic acids
- b)ATP in small stepwise units
- c)ATP in one large oxidation reaction
- d)Sugars
Correct answer is option 'B'. Can you explain this answer?
The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of
a)
Nucleic acids
b)
ATP in small stepwise units
c)
ATP in one large oxidation reaction
d)
Sugars
 | Ciel Knowledge answered |
The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of ATP step-wise. The three processes are involved in cellular respiration of food to produce energy, which will be used for various cellular activities.
Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates, and proteins?- a)Glucose-6-phosphate
- b)Fructose 1,6-bisphosphate
- c)Pyruvic acid
- d)Acetyl Co-A
Correct answer is option 'D'. Can you explain this answer?
a)
Glucose-6-phosphate
b)
Fructose 1,6-bisphosphate
c)
Pyruvic acid
d)
Acetyl Co-A
 | Lead Academy answered |
Acetyl Co-A is a key molecule that plays a central role in the catabolism of carbohydrates, fats, and proteins. It serves as a convergence point in the metabolic pathways of these macronutrients, entering the citric acid cycle where it undergoes further breakdown to produce energy. This makes it a common component in the respiration-mediated breakdown of all three types of biomolecules.
Why is the theoretical calculation of ATP gain from one molecule of glucose considered only an approximation in real cellular conditions?- a)Because the ATP yield varies depending on the cell type.
- b)Because different substrates can alter the pathway's efficiency.
- c)Because all pathways work simultaneously and substrates and ATP needs fluctuate dynamically.
- d)Because the ATP calculation is based solely on fermentation and not on aerobic respiration.
Correct answer is option 'C'. Can you explain this answer?
a)
Because the ATP yield varies depending on the cell type.
b)
Because different substrates can alter the pathway's efficiency.
c)
Because all pathways work simultaneously and substrates and ATP needs fluctuate dynamically.
d)
Because the ATP calculation is based solely on fermentation and not on aerobic respiration.
 | Partho Kumar answered |
Understanding ATP Yield from Glucose
The theoretical calculation of ATP gain from glucose is often approximated due to various dynamic cellular conditions.
Dynamic Cellular Environment
- Cells do not operate in isolation; they are part of complex networks where various metabolic pathways interact.
- The energy needs of a cell can fluctuate based on growth, activity levels, and environmental conditions.
Simultaneous Pathway Activity
- Multiple metabolic pathways, such as glycolysis, the citric acid cycle, and oxidative phosphorylation, can be active at the same time.
- This simultaneous operation means that the ATP yield from glucose can vary based on which pathways are more active at any given time.
Substrate Availability and Demand
- Different substrates (like fats and proteins) can also enter metabolic pathways, influencing overall energy production.
- The presence of alternative substrates can impact the efficiency and ATP yield of glucose metabolism.
Cell Type Variation
- Different cell types have varying metabolic capacities and energy demands, leading to differences in ATP production rates.
- For example, muscle cells and liver cells may utilize glucose differently based on their specific functions and energy needs.
Conclusion
In summary, the ATP yield from one molecule of glucose is only an approximation because cellular conditions—such as fluctuating ATP demands, simultaneous pathway activity, and substrate availability—significantly affect actual ATP production. Understanding these factors is crucial for a more accurate assessment of energy metabolism in living organisms.
The theoretical calculation of ATP gain from glucose is often approximated due to various dynamic cellular conditions.
Dynamic Cellular Environment
- Cells do not operate in isolation; they are part of complex networks where various metabolic pathways interact.
- The energy needs of a cell can fluctuate based on growth, activity levels, and environmental conditions.
Simultaneous Pathway Activity
- Multiple metabolic pathways, such as glycolysis, the citric acid cycle, and oxidative phosphorylation, can be active at the same time.
- This simultaneous operation means that the ATP yield from glucose can vary based on which pathways are more active at any given time.
Substrate Availability and Demand
- Different substrates (like fats and proteins) can also enter metabolic pathways, influencing overall energy production.
- The presence of alternative substrates can impact the efficiency and ATP yield of glucose metabolism.
Cell Type Variation
- Different cell types have varying metabolic capacities and energy demands, leading to differences in ATP production rates.
- For example, muscle cells and liver cells may utilize glucose differently based on their specific functions and energy needs.
Conclusion
In summary, the ATP yield from one molecule of glucose is only an approximation because cellular conditions—such as fluctuating ATP demands, simultaneous pathway activity, and substrate availability—significantly affect actual ATP production. Understanding these factors is crucial for a more accurate assessment of energy metabolism in living organisms.
What is a major difference between fermentation and aerobic respiration regarding ATP production?- a)Fermentation produces more ATP than aerobic respiration.
- b)Fermentation fully oxidizes glucose to CO2 and H2O, while aerobic respiration does not.
- c)Aerobic respiration results in a higher yield of ATP per glucose molecule than fermentation.
- d)NADH is oxidized more rapidly in fermentation than in aerobic respiration.
Correct answer is option 'C'. Can you explain this answer?
What is a major difference between fermentation and aerobic respiration regarding ATP production?
a)
Fermentation produces more ATP than aerobic respiration.
b)
Fermentation fully oxidizes glucose to CO2 and H2O, while aerobic respiration does not.
c)
Aerobic respiration results in a higher yield of ATP per glucose molecule than fermentation.
d)
NADH is oxidized more rapidly in fermentation than in aerobic respiration.
 | EduRev NEET answered |
c) Aerobic respiration results in a higher yield of ATP per glucose molecule than fermentation.
Explanation
- Fermentation:
- Occurs in the absence of oxygen.
- Glucose is only partially broken down (e.g., into ethanol + CO2 in yeast, or lactic acid in muscles).
- Produces only 2 ATP per glucose (through glycolysis).
- Aerobic respiration:
- Requires oxygen.
- Glucose is fully oxidized intoCO2 and H2O.
- Produces a much higher yield of ATP — about 36–38 ATP per glucose in eukaryotic cells.
So the major difference is the amount of ATP produced: aerobic respiration is far more efficient.
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