The bacteria grown in the medium containing S35 as a one source of sulphur show its incorporation into

Options

A. DNA
B. Protein
C. RNA
D. None of the above

Explanation

To solve the question regarding the incorporation of S35 (sulfur) in bacteria grown in a medium containing sulfur, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Source of Sulfur**: The question states that bacteria are grown in a medium containing S35, which is a radioactive isotope of sulfur. This indicates that sulfur is being provided as a nutrient source for the bacteria.

2. **Identifying the Biological Molecules**: We need to determine which biological molecules can incorporate sulfur. The main biological macromolecules are DNA, RNA, and proteins.

3. **Analyzing DNA and RNA**:
- **DNA**: The structure of DNA does not include sulfur in its nucleotides. Therefore, sulfur would not be incorporated into DNA.
- **RNA**: Similarly, RNA does not contain sulfur in its nucleotides. Thus, sulfur would not be incorporated into RNA either.

4. **Examining Proteins**: Proteins are made up of amino acids, some of which contain sulfur. The two primary amino acids that contain sulfur are cysteine and methionine. When bacteria are grown in a medium with sulfur, they can incorporate it into these amino acids, which are then used to synthesize proteins.

5. **Conclusion**: Since the sulfur from the medium is incorporated into proteins through the amino acids that contain sulfur, the correct answer to the question is that the bacteria incorporate S35 into proteins.

### Final Answer:
The bacteria grown in the medium containing S35 as a source of sulfur show its incorporation into **proteins**.

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