State whether the following statement is true or false. The modern model of plasma membrane structure was first described in 1986.
A. True
B. False

Answer

To determine whether the statement "The modern model of plasma membrane structure was first described in 1986" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Statement**: The statement claims that the modern model of plasma membrane structure was described in 1986.

2. **Understand the Modern Model**: The modern model of the plasma membrane is known as the "fluid mosaic model." This model describes the structure of the plasma membrane as a mosaic of various components (lipids, proteins, carbohydrates) that are fluid in nature.

3. **Research the Origin of the Model**: The fluid mosaic model was proposed by scientists Singer and Nicholson.

4. **Find the Year of Proposal**: The fluid mosaic model was first described in **1972**, not 1986.

5. **Evaluate the Statement**: Since the statement claims that the model was described in 1986, and we have established that it was actually described in 1972, the statement is incorrect.

6. **Conclusion**: Therefore, the answer to the question is **B. False**.