Which of the following protein functions is not associated with its correct integral protein?

Options

A. Carrier proteins-passage of molecules through the membrane
B. Enzymatic proteins-carry out metabolic reactions directly
C. Channel proteins-block the activity of carrier proteins
D. Cell recognition proteins-recognize pathogens

Explanation

To solve the question regarding which protein function is not associated with its correct integral protein, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Types of Integral Proteins:**
- Integral proteins can be classified into different types based on their functions, such as carrier proteins, channel proteins, and enzymatic proteins.

2. **Examine the Functions of Each Type:**
- **Carrier Proteins:** These proteins facilitate the passage of molecules through the membrane. They can operate via active transport (requiring energy) or passive transport (not requiring energy).
- **Channel Proteins:** These proteins form pores in the membrane that allow specific molecules or ions to pass through via passive transport.
- **Enzymatic Proteins:** These proteins catalyze metabolic reactions directly, meaning they facilitate biochemical reactions.
- **Cell Recognition Proteins:** These proteins are involved in recognizing pathogens and other cells, playing a role in immune response.

3. **Analyze Each Option:**
- **Carrier Proteins:** Correctly associated with the function of transporting molecules through the membrane.
- **Channel Proteins:** The claim that they "block the activity of carrier proteins" is incorrect. Channel proteins do not block carrier proteins; they serve a different function by allowing passive transport.
- **Enzymatic Proteins:** Correctly associated with carrying out metabolic reactions directly.
- **Cell Recognition Proteins:** Correctly associated with recognizing pathogens.

4. **Determine the Incorrect Association:**
- The statement that "channel proteins block the activity of carrier proteins" is not true. Channel proteins do not have this blocking function; hence, this option is the one that does not match with its correct integral protein function.

5. **Conclusion:**
- The correct answer to the question is that the function "channel proteins block the activity of carrier proteins" is not associated with its correct integral protein.

### Final Answer:
The function that is not associated with its correct integral protein is: **Channel proteins block the activity of carrier proteins.**

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