1. The experiment that showed bacteria could transform from one strain to another.
2. a) Mice injected with harmless bacteria from smooth colonies died.
b) Mice injected with heat-killed bacteria from smooth colonies died.
c) Mice injected with a mixture of bacteria from heat-killed smooth colonies and live rough colonies died.
3. The result suggested that the cause of pneumonia was not a chemical poison released by the disease-causing bacteria; it was something else, perhaps with hereditary disease-causing features.
4. Transformation is the process by which one strain of bacteria changes into another.
5. The substance causing the transformation might be the molecule responsible for heredity.
6. He hypothesized that DNA forms from the results of his experiments because DNA was the only molecule common to all cells.
7. The most convincing evidence that DNA was the genetic material was that when the protein coat was removed from the virus, the DNA alone could still infect bacteria.
8. Bacteria can acquire new traits through transformation, where they take up DNA from their environment. This is important for understanding how antibiotic resistance can spread among bacterial populations.
Parent Tip: Review the logic above to help your child master the concept of chapter 12 dna and rna worksheet answers.
