IB Biology HL C1.2.9 Hl Pyruvate Lactate Questions

Follow the final step of anaerobic respiration: pyruvate accepts hydrogen from reduced NAD to form lactate, regenerating NAD so glycolysis can continue in IB Biology HL C1.2.9.

Exam points

Explain how pyruvate accepts hydrogen or electrons from reduced NAD and is reduced to lactate.
Explain how this reaction regenerates NAD, allowing glycolysis and ATP production to continue without oxygen.

[Maximum number: 2]

Glucose is converted to pyruvate during the glycolysis stage of respiration.

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Outline how NAD is made available for glycolysis during anaerobic respiration in animal cells.

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a	NADH transfers electrons to pyruvate OR pyruvate acts as electron acceptor / pyruvate is reduced;
b	(pyruvate) converted to lactate;
c	NADH oxidized/converted to NAD OR NAD available to be reduced/converted to NADH again (in glycolysis);

IB Biology HL C1.2.9 Hl Pyruvate Lactate Questions question 1