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A2 Biology Coursework -Investigation into the effect of different concentrations of antibiotics on the growth of bacteria
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Biology Coursework Aim: My aim is to investigate the effect of different concentrations of antibiotics on the growth of bacteria. Hypothesis: I predict that as the concentration of the antibiotics increases the bacteria growth decreases Null Hypothesis There is no link between the concentration of antibiotics and the effects it has on the growth of the bacteria Theory Antibiotics work in 4 ways, which are listed below: 1. Cell Membrane Disruption - This involves making the cell fully permeable which results in substances moving into it causing it to burst and so kills the bacteria 2. Inhibiting Nucleic Acid Synthesis - This method doesn't kill the bacteria off but keeps the growth level static. The bacteria isn't able to replicate its DNA and so no binary fission occurs, causing the growth level to become static 3. Inhibiting Cell Wall Synthesis - This is where an antibiotic inhibits the enzyme required to form cross links within the cell wall...
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