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    7.

    In Hershey and Chase's experiment, what was the key observation that supported DNA as the genetic material?

    A

    Radioactive sulfur (35S^{35}S) was found inside the bacteria.

    B

    Radioactive phosphorus (32P^{32}P) remained outside the bacteria.

    C

    Both radioactive sulfur (35S^{35}S) and phosphorus (32P^{32}P) were found inside the bacteria.

    D

    Radioactive phosphorus (32P^{32}P) was found inside the bacteria.

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    10.

    In the Hershey-Chase experiment, what crucial observation confirmed that DNA, and not protein, was the genetic material injected into bacteria by bacteriophages?

    A

    Radioactive sulfur (35S) was found inside the bacterial cells, while radioactive phosphorus (32P) remained outside.

    B

    Both radioactive phosphorus (32P) and sulfur (35S) were found inside the bacterial cells.

    C

    Neither radioactive phosphorus (32P) nor sulfur (35S) were found inside the bacterial cells.

    D

    Radioactive phosphorus (32P) was found inside the bacterial cells, while radioactive sulfur (35S) remained outside.

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