Answer:
C. DNA from the S bacteria is necessary for bacterial transformation to occur.
Explanation:
These series of experiments determined that DNA is the genetic material which gives rise to a particular type of cell. As we can see, the S bacteria with degraded proteins were able to grow when the proteins and RNA were degraded. But they were not able to grow when their DNA was degraded. This experiment proved that proteins or RNA are not the genetic material, rather DNA is the material related to inheritance.
Question:
3. In a series of experiments, Griffith infected mice with nonvirulent R-strain bacteria and highly virulent S-strain bacteria. Heat-killed S bacteria were nonvirulent. However, the nonvirulent heat-killed S bacteria and the nonvirulent R bacteria together produced a virulent mixture. What did this demonstrate?
Answer Choices:
○ A. The S-strain bacteria had not been killed completely.
○ B. A transforming principle in the S bacteria allowed the nonvirulent R-strain to become virulent.
○ C. The translation of proteins, carbohydrates, lipids, and DNA is important in determining bacterial virulence.
○ D. The molecules present on the outside of bacteria determine whether it's virulent or nonvirulent.
Answer:
B. A transforming principle in the S bacteria allowed the nonvirulent R-strain to become virulent.
Reference:
3.2 Examine the structure of DNA and its function with genetic inheritance
DNA's Structure and Function in Genetic Inheritance READING ASSIGNMENT
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"...the combination of the heat-killed S-strain and the nonvirulent R-strain caused a 'bacterial transformation,' which rendered the combination highly virulent and fatal to the mouse." (PDF pg. 44)
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Explanation:
Penn Foster
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