Fill in the blanks.
Viruse grown in the presence of radioactive phosphorous contained radioactive_______but not radiocative_______.

Explanation

To fill in the blanks in the statement "Viruses grown in the presence of radioactive phosphorus contained radioactive _______ but not radioactive _______," we can follow these steps:

1. **Understanding the context**: The question refers to viruses grown in a medium containing radioactive phosphorus. This suggests that we need to identify what components of the virus would incorporate phosphorus.

2. **Identifying the components**: Phosphorus is a key element in nucleic acids (DNA and RNA) as it is part of the sugar-phosphate backbone. Therefore, if the viruses are grown in radioactive phosphorus, it will be incorporated into their nucleic acids.

3. **Determining the first blank**: Since the viruses will contain radioactive phosphorus in their nucleic acids, we can conclude that they will contain radioactive **DNA** (or RNA, depending on the type of virus, but typically DNA is implied in such contexts).

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