What is the process that converts sugar mixed with water into ethanol by yeast?

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Test your knowledge of IGCSE Coordinated Science terms. Study with flashcards and multiple-choice questions, each with hints and explanations. Prepare effectively for your exams!

Multiple Choice

What is the process that converts sugar mixed with water into ethanol by yeast?

Explanation:
Fermentation is the process by which yeast converts sugar in water into ethanol and carbon dioxide, especially when oxygen is not available. Yeast uses enzymes to break down sugar; during this anaerobic pathway, NAD+ is regenerated as pyruvate is converted into ethanol and CO2, allowing glycolysis to continue and a small amount of energy to be produced. This is why ethanol appears in the mixture, which is not produced in respiration, photosynthesis, or digestion. The typical result is ethanol and carbon dioxide from glucose.

Fermentation is the process by which yeast converts sugar in water into ethanol and carbon dioxide, especially when oxygen is not available. Yeast uses enzymes to break down sugar; during this anaerobic pathway, NAD+ is regenerated as pyruvate is converted into ethanol and CO2, allowing glycolysis to continue and a small amount of energy to be produced. This is why ethanol appears in the mixture, which is not produced in respiration, photosynthesis, or digestion. The typical result is ethanol and carbon dioxide from glucose.

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