Final answer:
The technique used to investigate the effects of antibiotics on bacterial growth is the disk diffusion test, specifically the Kirby-Bauer assay. In this test, a filter paper disk saturated with the antibiotic is placed on a lawn of bacteria, and if the bacteria are susceptible, a clear zone of inhibition will be seen around the disk.
Step-by-step explanation:
The technique that can be used to investigate the effects of antibiotics on bacterial growth is the disk diffusion test, specifically the Kirby-Bauer assay. In this test, bacterial cells are inoculated onto a specific type of medium and a filter paper disk saturated with the antibiotic is placed on the lawn of bacteria. The antibiotic diffuses into the medium and if the bacteria are susceptible, a clear zone of inhibition will be seen around the disk.