A-Level BiologyYear 2019Q16
page 11 16. Bacterial cells were exposed to disinfectant for 14 minutes. Every 2 minutes a sample was taken and the number of viable cells counted. The results are shown in the graph. 0 2 4 6 8 10 12 14 time (minutes) number of viable cells 1 000 000 100 000 10 000 1000 100 10 1 Calculate the percentage decrease in viable cells after being exposed to disinfectant for 6 minutes. A 99·60 B 99·87 C 996 000·00 D 998 700·00 [Turn over
Paper Source:NH_Biology_all_2019.pdf
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectBiology
Official MarksVariable (2–6 marks)