State true or false. The lipid portion of a plasma membrane acts like a liquid at the temperature of the human body.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks whether the lipid portion of a plasma membrane acts like a liquid at the temperature of the human body. We need to determine if this statement is true or false.

2. **Reviewing the Structure of the Plasma Membrane**: The plasma membrane is primarily composed of a lipid bilayer, which includes phospholipids and cholesterol. The arrangement of these lipids allows for fluidity.

3. **Fluid Mosaic Model**: The fluid mosaic model, proposed by scientists Singer and Nicolson, describes the plasma membrane as a mosaic of various components (lipids and proteins) that can move freely within the layer. This model indicates that the lipid portion behaves like a liquid.

4. **Temperature Consideration**: The human body temperature is approximately 37°C (98.6°F). At this temperature, the lipids in the plasma membrane remain in a fluid state, allowing for flexibility and movement.

5. **Role of Cholesterol**: Cholesterol is present in the plasma membrane and helps to maintain fluidity. It can adjust the fluidity of the membrane depending on temperature, ensuring that the membrane remains functional at body temperature.

6. **Conclusion**: Since the lipid portion of the plasma membrane does indeed act like a liquid at the temperature of the human body, we conclude that the statement is true.

**Final Answer**: True.

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