State whether the following statements are true or false. Lipid-soluble molecules are able to diffuse into a cell more rapidly than water-soluble molecules.
A. True
B. False

Answer

To determine whether the statement "Lipid-soluble molecules are able to diffuse into a cell more rapidly than water-soluble molecules" is true or false, let's analyze the properties of lipid-soluble and water-soluble molecules in relation to cell membranes.

### Step-by-Step Solution:

1. **Understanding Cell Membrane Structure**:
- The cell membrane is primarily composed of a lipid bilayer, which consists of hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails.
- The hydrophobic core of the membrane is made up of the fatty acid tails of the phospholipids.

2. **Properties of Lipid-Soluble Molecules**:
- Lipid-soluble molecules, also known as fat-soluble molecules, can easily dissolve in the lipid bilayer.
- Examples include sterols, alcohols, and fat-soluble vitamins (A, D, E, K).
- These molecules can diffuse through the hydrophobic core of the membrane without needing assistance.

3. **Properties of Water-Soluble Molecules**:
- Water-soluble molecules are typically polar and cannot easily penetrate the hydrophobic core of the lipid bilayer.
- These molecules require specific transport mechanisms (like channels or carriers) to cross the membrane.

4. **Comparative Diffusion Rates**:
- Since lipid-soluble molecules can directly diffuse through the lipid bilayer, they do so more rapidly than water-soluble molecules, which face barriers to diffusion.

5. **Conclusion**:
- Given that lipid-soluble molecules can diffuse into a cell more rapidly than water-soluble molecules, the statement is **True**.

### Final Answer:
**A. True**

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