The axonal membrane is __ to negatively charged proteins present in the axoplsm:

Options

A. Selectivity permeable
B. Permeable
C. Semipermeable
D. Impermeable

Answer

To answer the question "The axonal membrane is __ to negatively charged proteins present in the axoplasm," we need to analyze the properties of the axonal membrane in relation to these proteins.

### Step-by-Step Solution:

1. **Understanding the Axonal Membrane**: The axonal membrane is a crucial part of a neuron, and it plays a significant role in the conduction of nerve impulses. It has specific permeability characteristics.

2. **Defining Permeability Types**:
- **Selectively Permeable**: This means the membrane allows certain substances to pass while blocking others.
- **Permeable**: This means the membrane allows all substances to pass through freely.
- **Semi-permeable**: This is similar to selectively permeable, allowing some substances to pass while blocking others.
- **Impermeable**: This means the membrane does not allow any substances to pass through.

3. **Analyzing the Situation**: In the context of the axonal membrane:
- When the neuron is at rest (not conducting an impulse), the membrane is more permeable to potassium ions (K+) and nearly impermeable to sodium ions (Na+) and negatively charged proteins.
- Negatively charged proteins are present in the axoplasm, and the axonal membrane does not allow these proteins to pass through.

4. **Conclusion**: Since the axonal membrane does not allow negatively charged proteins to pass through, it is considered **impermeable** to them.

### Final Answer:
The axonal membrane is **impermeable** to negatively charged proteins present in the axoplasm.

---