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Q5:
Give the schematic representation of an overall view of Krebs’ cycle.
Solution :
Step 1: Theoretical Foundation of the Krebs Cycle (Citric Acid Cycle)
The Krebs cycle occurs in the mitochondrial matrix. It represents the final common pathway for the oxidation of fuel molecules—amino acids, fatty acids, and carbohydrates. The cycle initiates when Acetyl-CoA ($2C$) condenses with Oxaloacetic acid ($4C$) to form Citric acid ($6C$).
Step 2: Sequential Chemical Transformations
| Substrate | Product | Key Enzyme / Process | By-product |
|---|---|---|---|
| Acetyl-CoA + Oxaloacetic acid | Citric acid | Citrate synthase | $H_2O$ |
| Citric acid | $\alpha$-Ketoglutaric acid | Dehydrogenation/Decarboxylation | $NADH + H^+$, $CO_2$ |
| $\alpha$-Ketoglutaric acid | Succinyl-CoA | $\alpha$-KG dehydrogenase | $NADH + H^+$, $CO_2$ |
| Succinyl-CoA | Succinic acid | Substrate-level phosphorylation | $GTP/ATP$ |
| Succinic acid | Malic acid | FAD reduction | $FADH_2$ |
| Malic acid | Oxaloacetic acid | Regeneration | $NADH + H^+$ |
Step 3: Schematic Representation
Step 4: Stoichiometric Summary per Acetyl-CoA
Each turn of the Krebs cycle processes one molecule of Acetyl-CoA, yielding the following energy-rich molecules via oxidative decarboxylation and substrate-level phosphorylation [Per the metabolic pathways defined in the Citric Acid Cycle]:
- $3 \times NADH + H^+$
- $1 \times FADH_2$
- $1 \times GTP$ (which converts to $ATP$)
- $2 \times CO_2$ (released as waste)
Final Solution: The Krebs cycle is a cyclic metabolic pathway where a 2-carbon Acetyl group from Acetyl-CoA combines with a 4-carbon Oxaloacetic acid to form Citric acid, which undergoes successive decarboxylation and dehydrogenation reactions to regenerate Oxaloacetic acid, ultimately producing $3NADH$, $1FADH_2$, and $1ATP$ per turn.
More Questions from Class 11 Biology Respiration in Plants EXERCISES
- Q1(a): Differentiate between (a) Respiration and Combustion
- Q1(b): Differentiate between (b) Glycolysis and Krebs’ cycle
- Q1(c): Differentiate between (c) Aerobic respiration and Fermentation
- Q2: What are respiratory substrates? Name the most common respiratory substrate.
- Q3: Give the schematic representation of glycolysis?
- Q4: What are the main steps in aerobic respiration? Where does it take place?
- Q6: Explain ETS.
- Q7(a): Distinguish between the following: (a) Aerobic respiration and Anaerobic respiration
- Q7(b): Distinguish between the following: (b) Glycolysis and Fermentation
- Q7(c): Distinguish between the following: (c) Glycolysis and Citric acid Cycle
- Q8: What are the assumptions made during the calculation of net gain of ATP?
- Q9: Discuss “The respiratory pathway is an amphibolic pathway.”
- Q10: Define RQ. What is its value for fats?
- Q11: What is oxidative phosphorylation?
- Q12: What is the significance of step-wise release of energy in respiration?
CBSE Solutions for Class 11 Biology Respiration in Plants
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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