Q.9 What is the end product in the process of glycolysis in anaerobic and aerobic condition respectively?
- Pyruvate and 3-phosphoglycerate
- Lactate and phosphoenol pyruvate
- Lactate and pyruvate
- Pyruvate and lactate
In glycolysis, the end product is pyruvate under aerobic conditions and lactate under anaerobic conditions, reflecting the fate of pyruvate based on oxygen availability.
Question Breakdown
This question probes core biochemistry concepts in metabolic pathways, essential for life sciences students studying glycolysis (EMP pathway) for exams like GATE, where understanding ATP yield and pyruvate conversion is key.
Option Explanations
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Pyruvate and 3-phosphoglycerate: Incorrect; pyruvate is the true end product of glycolysis (10 enzymatic steps from glucose), while 3-phosphoglycerate is an intermediate after step 7.
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Lactate and phosphoenol pyruvate: Wrong; lactate forms post-glycolysis in anaerobiosis via LDH, but phosphoenol pyruvate (PEP) is an upstream intermediate just before pyruvate kinase step.
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Lactate and pyruvate: Correct order reversed; glycolysis universally ends in pyruvate, which ferments to lactate anaerobically (muscle/yeast) or enters mitochondria aerobically.
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Pyruvate and lactate: Incorrect sequence; pyruvate precedes lactate, which only accumulates without O₂ to regenerate NAD⁺ for glycolysis continuation.
Introduction to Glycolysis End Products
The end product in the process of glycolysis in anaerobic and aerobic condition respectively is lactate and pyruvate, powering ATP production universally from glucose. This 10-step cytoplasmic pathway nets 2 ATP, 2 NADH regardless of conditions.
Glycolysis Pathway Overview
Glucose → glucose-6-P → … → phosphoenolpyruvate → pyruvate (via pyruvate kinase). Aerobically, pyruvate enters TCA/ETC (total ~36 ATP/glucose); anaerobically, pyruvate → lactate (via LDH) to recycle NAD⁺.
Options Comparison
Option Anaerobic End Aerobic End Accuracy Pyruvate & 3-PG Pyruvate 3-PG Wrong; 3-PG intermediate Lactate & PEP Lactate PEP Wrong; PEP pre-pyruvate Lactate & pyruvate Lactate Pyruvate Correct sequence Pyruvate & lactate Pyruvate Lactate Reversed; ignores fermentation Pyruvate/lactate switch optimizes energy in hypoxia.
Biochemistry Applications
Vital for muscle fatigue studies, cancer metabolism (Warburg effect), and enzymology; aligns with TCA cycle, ETC in graduate curricula.
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