A modified form of adenine, a purine

Options

A. was discovered from autoclaved having sperm DNA
B. is naturally found in plants and helps in preventing apical dominance
C. was isolated from corn kernels and coconut milk
D. is a synthetic compound which promotes cell division in plants

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for a modified form of adenine, which is a type of purine.

2. **Research the Modified Form**: The modified form of adenine that is relevant here is kinetin. Kinetin is a cytokinin, a class of plant hormones that promote cell division.

3. **Discovery of Kinetin**: Kinetin was discovered by scientists Miller and Skoug. They isolated it from autoclaved herring sperm DNA.

4. **Understanding Autoclaving**: Autoclaving is a sterilization process that uses high-pressure steam to eliminate all forms of life, including bacteria and viruses. In this case, it was used to sterilize the herring sperm DNA before the extraction of kinetin.

5. **Source of Kinetin**: Kinetin was specifically isolated from the DNA of herring fish, not from corn or any other source. This is an important detail as it clarifies the origin of kinetin.

6. **Function of Kinetin**: Kinetin has the ability to induce cell division, which is a crucial function in plant growth and development.

7. **Evaluating Options**: Based on the information:
- Option 1 is correct as it states that kinetin is a modified form of adenine.
- Option 2 is incorrect as it suggests that kinetin is naturally found in plants, while it was actually isolated from fish.
- Option 3 is incorrect because it claims that kinetin was isolated from corn.
- Option 4 is also incorrect as it states that kinetin is a synthetic compound, while it was derived from a natural source (herring sperm DNA).

8. **Conclusion**: The correct answer to the question is Option 1, which identifies kinetin as a modified form of adenine.

---