The Question is from neet-botany , and it was created by the author B VENKAT

Question

Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Common metabolic intermediates in cellular respiration
	**Related Topics**: Glycolysis, Beta-oxidation, Amino acid catabolism, Krebs Cycle
	**Prerequisites**: Basic knowledge of cellular respiration and metabolic pathways
## SOLUTION PATHWAY
**Given Information**:
	The question asks for a common metabolite in the breakdown of fats, carbohydrates, and proteins during respiration.
**Method & Steps**:
	1. **Recall the breakdown pathways**: Think about the main pathways for catabolizing each biomolecule: carbohydrates (glycolysis), fats (beta-oxidation), and proteins (amino acid catabolism).
		Reasoning: Understanding the beginning and intermediate products of each pathway is crucial.
	2. **Identify the common intermediate**: Determine the point where these pathways converge. Glycolysis produces pyruvate. Pyruvate then converts into acetyl CoA. Fatty acids are broken down to acetyl CoA via beta-oxidation. Amino acids are also converted to acetyl CoA or intermediates that enter the Krebs cycle.
		Working: Carbohydrates -> Glucose -> Pyruvate -> Acetyl CoA
			Fats -> Fatty acids -> Acetyl CoA
			Proteins -> Amino Acids -> Various intermediates including Acetyl CoA
	3. **Conclude**: Acetyl CoA is the common molecule that feeds into the Krebs Cycle.
		Result: Acetyl CoA is the metabolite common to all three pathways.
		Verification: The Krebs cycle uses Acetyl CoA as a primary input. All three biomolecules converge to this.
 ## OPTION ANALYSIS
[A] :x: Glucose-6-phosphate is an intermediate in glycolysis (carbohydrate breakdown) but not a common intermediate for fats and proteins.
[B] :x: Fructose-6-bisphosphate is another intermediate in glycolysis but not a common product for fats and proteins.
[C] :x: Pyruvic acid is the end product of glycolysis, but it is not a direct intermediate of fat breakdown. It is converted to acetyl CoA before entering the Krebs cycle. 
[D] ✓: Acetyl CoA is the common intermediate produced from the breakdown of carbohydrates, fats and proteins. It is the key input to the Krebs cycle.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing intermediates: Mistaking intermediates of one pathway for common intermediates.
			How to avoid: Review each metabolic pathway and focus on the convergence point.
		2. Overlooking beta-oxidation: Forgetting how fats are broken down into acetyl CoA. 
			How to avoid: Understand the basic breakdown products of each pathway.
	**Quick Tips**:
		1. Use a diagram: Visualizing the pathways helps to identify the common points.
		2. Focus on the Krebs Cycle: Remember that acetyl CoA is the primary fuel for the Krebs cycle.

B VENKAT · Answer

Glucose-6-phosphate

B VENKAT · Answer

Fructose, 6-bisphosphate

B VENKAT · Answer

Pyruvic acid

B VENKAT · Answer

The correct Option is "Acetyl Co-A"

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