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IB Biology HL C1.2.10 Hl Anaerobic Respiration in Yeast Questions

Explore how yeast converts pyruvate to ethanol and carbon dioxide, regenerating NAD for glycolysis; see why fermentation matters in baking and brewing for IB Biology HL C1.2.10.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how yeast converts pyruvate to ethanol and carbon dioxide during alcoholic fermentation.
  • Explain that fermentation regenerates NAD, allowing glycolysis to continue without oxygen.
  • Relate carbon dioxide release during yeast fermentation to baking and brewing.

IB Biology HL C1.2.10 Hl Anaerobic Respiration in Yeast Questions question 1

[Maximum number: 1]

Bread dough is made by mixing flour, water and yeast. If the dough is then kept at about 30∘C30^{\circ} \mathrm{C}, it expands.

Figure for Question IB Biology HL C1.2.10 Hl Anaerobic Respiration in Yeast Questions question 1 — IB Biology HL

What is the main reason for choosing this temperature?

A

Carbon dioxide expands at this temperature.

B

This is the optimum temperature for the enzymes used in aerobic cell respiration.

C

Lactate produced by anaerobic cell respiration causes the release of carbon dioxide at this temperature.

D

At this temperature, yeast produces carbon dioxide rapidly by anaerobic cell respiration.

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