Which of the following eukaryotes are devoid of histone proteins ?

Options

A. Golden algae
B. Euglenoids
C. Fire algae
D. Slime Mould

Answer

To determine which of the following eukaryotes are devoid of histone proteins, we need to analyze each option provided:

1. **Golden Algae**:
- Golden algae, also known as chrysophytes, are characterized by the presence of yellow and brown carotenoids.
- They contain histone proteins in their DNA, which helps in the packaging and organization of their genetic material.
- Therefore, this option is incorrect.

2. **Euglenoids**:
- Euglenoids are unicellular organisms that possess two flagella and exhibit euglenoid movement.
- They also contain histone proteins, which are essential for the organization of their DNA.
- Hence, this option is also incorrect.

3. **Fire Algae (Dinoflagellates)**:
- Dinoflagellates, commonly referred to as fire algae, are unique among eukaryotes as they lack histone proteins in their DNA.
- Their DNA remains in a condensed form, and they are known for their luminescent properties due to the pigment luciferin, which reacts with the enzyme luciferase to produce light.
- This makes fire algae the correct answer.

4. **Slime Molds**:
- Slime molds are fungus-like protists characterized by a multicellular structure known as plasmodium.
- They do have histone proteins in their DNA, which aids in the organization of their genetic material.
- Therefore, this option is incorrect.

**Conclusion**: The only eukaryotes from the provided options that are devoid of histone proteins are **Fire Algae (Dinoflagellates)**.