Question

in a series of experiments Griffith infected mi've with oa nonvirulent r strain bacteria and highly virulent s strain bacteria. heat killed bacteria were nonvirulent . however the nonvirulentheat killed bacteria and the nonvirulent r bacteria together produced a virulent. mixture. what did this demonstrate.​

Answer 1

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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Answer 2

This demonstrate the transforming principle.

Step-by-step explanation:

Griffith performed the experiment on the virulent bacteria and non- virulent bacteria. The non- virulent bacteria produce rough colonies and did not cause pneumonia. The virulent bacteria produces smooth colonies that kill the mice and caused pneumonia.

When Griffith mixed the on virulent bacteria and heat killed virulent bacteria he found that the mice were killed. He concluded that there was transforming principle that turns the non- virulent bacteria into virulent bacteria from the heat killed bacteria. Something, has been transferred from the heat killed bacteria to the non- virulent bacteria. Later, he found that dead mice blood sample contained both the non-virulent rough bacteria strains and virulent smooth strains of bacteria.