Describe the industrial manufacture of single cell protein.

Mark scheme

Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.

1. [max 8] 1. sterilised / aseptic technique ;
2. 2. fermenter ;
3. 3. bacterium / fungus / algae / named example;
4. 4. substrate / cultured medium or named / broth / any two chemicals in the medium;
5. 5. oxygen / air;
6. 6. bubbles / sparger / aerator / paddle / stirrer AW ;
7. 7. temperature regulation / control / cooling jacket;
8. 8. pH ref;
9. 9. optimum or best for growth or reproduction of organism ;
10. 10. filtration / collection / harvesting / separating (the product);
11. 11. name / use of product e.g. mycoprotein / meat substitute / cattle feed;
12. [max 2] 1. size reference/extremely small AW;
13. 2. reproduce only in living cells/pathogenic AW/parasitic; A named viral disease
14. 3. specific;
15. 4. may need to separate from living tissue/difficult to isolate ;