Investigate the effect of antiseptics or antibiotics on bacterial growth. (RP 2-separate science). This practical was completed in two lessons, students spent the second lesson measuring the zones of inhibition as well as calculating bacterial growth. Homework on bacterial divisions has also been included.
NB: Please see B5.4 Preventing bacterial growth if you would like the lesson that follows after this practical.
AQA spec link: 18.104.22.168
Relevant chapter: B5 Communicable diseases. AQA Biology third edition textbook-Page
In doing this practical students should cover these parts of the apparatus and techniques requirements.
AT 1 – use appropriate apparatus to record length and area.
AT 3 – use appropriate apparatus and techniques to observe and measure the process of bacterial growth.
AT 4 – safe and ethical use of bacteria to measure physiological function and response to antibiotics and antiseptics in the environment.
AT 8 – the use of appropriate techniques and qualitative reagents in problem-solving contexts to find the best antibiotic to use or the best concentration of antiseptic to use.