What was the significance of Griffith's and Avery's "transformed" cells?

What will be an ideal response?


Griffith's experiments showed that previously nonvirulent bacteria, when exposed to heat-killed virulent bacteria, would kill a mouse. This demonstrated that some element of the heat-killed bacteria was transmitted to the nonvirulent bacteria, causing them to be lethal. He also found that these "transformed" bacteria, when cultured, gave rise to daughter cells that were also virulent. Avery and coworkers carried out further experiments, analyzing what component of the cells was causing this "transformation," and it was found to be DNA.

Biology & Microbiology

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Which of the following type of microscopy would be most effective in visualizing the fine structure of viruses and cytoskeletal filaments 10–25 nanometers in diameter?

A. standard light microscopy B. phase-contrast light microscopy C. transmission electron microscopy D. darkfield light microscopy E. differential-interference microscopy

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All of the following pertain to the atom Carbon-14 except it

A. has 6 protons. B. has 6 electrons. C. is an isotope of carbon. D. has 14 neutrons.

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An increase in the size of the ozone hole would be expected to _____

a. increase skin cancers b. reduce respiratory disorders c. both a and b

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Four of the five scientists listed below were involved

in the development of the double helix idea of DNA. Select the exception. a. Wilkins b. Griffith c. Watson d. Franklin e. Crick

Biology & Microbiology