Pellicle in Euglenoids is :

Options

A. proteinaceous bilayer, striped, flexible
B. proteinaceous , striped , rigid
C. cell membrane, unstriped, flexible
D. proteinaceous, striped, flexible

Answer

**Step-by-Step Solution:**

1. **Understanding Euglenoids**: Euglenoids, such as Euglena, are a group of single-celled organisms that possess characteristics of both plants and animals. They are known for their unique structure and flexibility.

2. **Identifying the Structure**: Unlike many other cells, Euglena does not have a rigid cell wall. Instead, it has a specialized structure called a pellicle.

3. **Defining the Pellicle**: The pellicle in Euglenoids is composed of protein layers. It is important to note that this structure is not rigid like a typical cell wall.

4. **Characteristics of the Pellicle**: The pellicle is described as being "proteinaceous" and "flexible." This flexibility allows Euglena to move and change shape, which is essential for its locomotion.

5. **Supporting Structures**: The pellicle is supported by microtubules arranged in strips that spiral around the cell. This arrangement contributes to the pellicle's flexibility and ability to undergo a movement known as "metaboly," where the strips slide over one another.

6. **Conclusion**: Based on the characteristics of the pellicle and its composition, we can conclude that the pellicle in Euglenoids is best described as "proteinaceous, stripped, and flexible."

7. **Final Answer**: The correct option is D: "proteinaceous, stripped, and flexible."

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