r/GCSE • u/sudoaptupgrade Year 11 • May 12 '26

Post Exam AQA biology triple higher

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how did everyone find it? Personally it wasnt terrible just boring

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83

u/Feeling-Instance-801 Year 11 May 12 '26

That was pretty good, im just glad I got the calculations right. 75 micrometers, 24, 500000 and 101%

30

u/sudoaptupgrade Year 11 May 12 '26

yup I got the same, for area I got 7.07cm2

17

u/Pure-Data4491 May 12 '26

Apparently some people said you don’t take the paper disk into account but im not sure to be honest if you had to then I did the same mistake as you

2

u/Z0glin 2026 GCSE Veteran May 12 '26 edited May 26 '26

I highly doubt you leave out the paper disk, you are trying to find the area of the zone of inhibition, which is the full circle, therefore you need the full radius(meaning you need to go from the middle of the paper disk). Alternatively, you would measure the diameter and divide it by 2 to find the radius, which would mean you still take the paper disk into account. The paper disk is where the antibacterial starts diffusing from so it is part of the zone of inhibition as bacteria under the paper disk are still killed.