The figure shows a fermenter used to grow Fusarium to make mycoprotein.
Figure: A fermenter used to grow Fusarium to produce mycoprotein

The glucose syrup that feeds the Fusarium enters the fermenter at A.
Name the substance that enters the fermenter at B.
Explain why the substance entering at B is needed.
Cold water is passed through the jacket labelled D.
Explain why this is necessary.
The Fusarium is removed from the fermenter at E, then harvested and purified.
Give one reason why the mycoprotein must be purified.
42 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.