Which of the following statements is correct ?

Options

A. Ribosomes do not contain DNA
B. Eulkaryotic 80 S ribosomes break into 50 S and 30 S
C. Plasmodesmata are found as intercellular junction between animal cells
D. Ribosomes were discovered by Beadle and Tatum

Answer

To solve the question "Which of the following statements is correct?", we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Evaluate the First Statement: "Ribosomes do not contain DNA."**
- Ribosomes are cellular structures responsible for protein synthesis. They are composed of ribosomal RNA (rRNA) and proteins. Importantly, ribosomes do not contain DNA.
- **Conclusion**: This statement is **correct**.

2. **Evaluate the Second Statement: "Eukaryotic 80S ribosomes break into 50S and 30S."**
- Eukaryotic ribosomes are classified as 80S, which consist of two subunits: 60S and 40S. The statement incorrectly mentions the subunits as 50S and 30S, which is characteristic of prokaryotic ribosomes.
- **Conclusion**: This statement is **incorrect**.

3. **Evaluate the Third Statement: "Plasmodesmata are found as the intercellular junctions between the animal cells."**
- Plasmodesmata are channels that allow communication and transport between plant cells. In animal cells, the equivalent structures are called gap junctions. Therefore, this statement is incorrect as it misattributes plasmodesmata to animal cells.
- **Conclusion**: This statement is **incorrect**.

4. **Evaluate the Fourth Statement: "Ribosomes were discovered by the Widdle and Tertum."**
- The discovery of ribosomes is credited to George E. Palade, not Widdle and Tertum. Therefore, this statement is also incorrect.
- **Conclusion**: This statement is **incorrect**.

### Final Answer:
Based on the evaluations, the only correct statement is the first one: **"Ribosomes do not contain DNA."**

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