| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.SL.TZ1.11 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Determine | Question number | 11 | Adapted from | N/A |
Question
Benzene is a cancer-causing component of crude oil. Some halophilic bacteria degrade benzene. Using a culture of bacteria obtained from an oil fi eld in the US, degradation of benzene was studied by microbiologists.
The microbiologists cultured the bacteria at different concentrations of sodium chloride (NaCl) and measured the amount of benzene left at different times.
Determine the optimum concentration of sodium chloride for benzene degradation.
[1]
a.
State the genus of halophilic bacteria in the soil that could be degrading the benzene.
[1]
b.
Markscheme
1 mol dm-3
a.
Marinobacter
b.
Examiners report
[N/A]
a.
[N/A]
b.
Syllabus sections
Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.3 Environmental protection
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