Saccharomyces species (yeast) are widely used in the commercial production of bread and bioethanol from plant sugars.
Name the kingdom of organisms that includes Saccharomyces.
What is meant by the term anaerobic?
Write the word equation for anaerobic respiration (fermentation) in these yeast cells.
During industrial fermentation, the growth media are prepared and the fermentation bioreactors are sterilised. Describe one method, other than heating, that can be used to sterilise the equipment.
Why is it important to use sterilised equipment?
A common sugar source used in industrial fermentation is sucrose. Name the enzyme that digests sucrose.
Name the two simple sugars produced when sucrose is digested.
During the fermentation process, the number of live yeast cells initially increases, but eventually decreases towards the end of the run. Explain why the number of live yeast cells decreases towards the end of the process.
74 exam-style questions on Edexcel IGCSE Biology Food production. Each one has a worked solution and a mark scheme showing where the marks go.