| Date | May 2016 | Marks available | 1 | Reference code | 16M.3.SL.TZ0.9 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | State | Question number | 9 | Adapted from | N/A |
Question
The photograph shows apparatus used to culture microorganisms in order to produce a metabolite.
State the general term for the reaction, involving microorganisms, that takes place in the apparatus shown.
Other than temperature and pH, state one variable that should be monitored during continuous culture in the apparatus shown.
State the binomial name of an organism used in continuous culturing to produce citric acid used as a preservative.
Markscheme
Fermentation
O2 «uptake»
CO2 «production»
Cell density
Pressure
Speed of stirrer
Quantity of nutrients/substrate/named nutrient
Aspergillus niger
Complete genus and species name is required.
Examiners report
Fairly well answered by the few candidates attempting this option.
Fairly well answered by the few candidates attempting this option.
Fairly well answered by the few candidates attempting this option.
