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Sagot :
The different parts of the experiment to test if E. coli is as sensitive to a new antibiotic as it is to tetracycline would be as follows:
- Disc soaked in tetracycline - positive control
- Diameter of zone on inhibition - dependent variable
- Disc soaked in the new antibiotic - experimental
- The discs soaked in their respective solutions - independent variable
- Discs soaked in Dl water - negative control
In experiments, positive controls are groups that are given treatments with already established results while negative controls are groups given the placebo but subject to the same experimental conditions.
The experimental groups are those that receive treatment whose outcome is yet to be known or about to be determined.
- In this case, tetracycline is already known to have certain effects on E. coli, hence the discs soaked in tetracycline act as the positive control.
- Dl water produces no effect and hence act as the negative control.
- The effects that the new antibiotic would have on E. coli is not known yet, hence, it acts as the experimental.
Dependent variables are the actual variables to be measured in the course of experiments while independent variables are those supplied and manipulated by the researcher.
Dependent variables are results of 'effects' of the independent 'causal' variables. Hence, in this case, the supplied variables are the discs soaked in their respective solutions. They cause an effect that is measurable as zone of inhibition, the dependent variable.
More on various experimental groups can be found here: https://brainly.com/question/17602354
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