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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?
Most Upvoted Answer
Which of the following biomolecules is common to respiration-mediated ...
Common Biomolecule in Metabolism
In cellular respiration, the breakdown of fats, carbohydrates, and proteins converges at a key metabolic intermediate known as Acetyl CoA.
Role of Acetyl CoA
- Acetyl CoA is crucial for the Krebs cycle (Citric Acid Cycle), which is essential for energy production.
- It acts as a common substrate that links various metabolic pathways.
Pathway Overview
- Fats:
- Triglycerides are broken down into glycerol and fatty acids.
- Fatty acids undergo beta-oxidation, producing Acetyl CoA.
- Carbohydrates:
- Glucose is metabolized through glycolysis to form pyruvate.
- Pyruvate is then converted into Acetyl CoA before entering the Krebs cycle.
- Proteins:
- Proteins are broken down into amino acids.
- Certain amino acids can be converted into pyruvate or directly into Acetyl CoA.
Conclusion
Acetyl CoA serves as a central hub in metabolism, allowing for the efficient extraction of energy from various biomolecules. This versatility makes it a critical component in cellular respiration, unifying the metabolic pathways of fats, carbohydrates, and proteins. Therefore, option 'D' (Acetyl CoA) is the correct answer.
In cellular respiration, the breakdown of fats, carbohydrates, and proteins converges at a key metabolic intermediate known as Acetyl CoA.
Role of Acetyl CoA
- Acetyl CoA is crucial for the Krebs cycle (Citric Acid Cycle), which is essential for energy production.
- It acts as a common substrate that links various metabolic pathways.
Pathway Overview
- Fats:
- Triglycerides are broken down into glycerol and fatty acids.
- Fatty acids undergo beta-oxidation, producing Acetyl CoA.
- Carbohydrates:
- Glucose is metabolized through glycolysis to form pyruvate.
- Pyruvate is then converted into Acetyl CoA before entering the Krebs cycle.
- Proteins:
- Proteins are broken down into amino acids.
- Certain amino acids can be converted into pyruvate or directly into Acetyl CoA.
Conclusion
Acetyl CoA serves as a central hub in metabolism, allowing for the efficient extraction of energy from various biomolecules. This versatility makes it a critical component in cellular respiration, unifying the metabolic pathways of fats, carbohydrates, and proteins. Therefore, option 'D' (Acetyl CoA) is the correct answer.
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Community Answer
Which of the following biomolecules is common to respiration-mediated ...
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.
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