Proteins that form huge pores in the outer membrane of the plastids, mitochondria and some bacteria allowing molecules upto size of small proteins to pass through, are

Answer

To answer the question regarding the proteins that form huge pores in the outer membrane of plastids, mitochondria, and some bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Context**: The question refers to proteins that create large pores in the membranes of certain organelles and bacteria. This is important because it sets the stage for identifying the specific type of protein involved.

2. **Identifying the Function**: These proteins allow the passage of molecules, particularly small proteins and macromolecules, across the membrane. This indicates that the proteins must have a specific structure that facilitates this transport.

3. **Recognizing the Type of Proteins**: The proteins in question are involved in forming channels or pores that enable the movement of larger molecules than what typical membrane transport proteins would allow.

4. **Naming the Proteins**: Based on the function and the context provided, the proteins that fit this description are known as "porins." Porins are integral membrane proteins that form large channels in the outer membrane of plastids, mitochondria, and some bacteria.

5. **Concluding the Answer**: Therefore, the answer to the question is that the proteins forming huge pores in the outer membrane of plastids, mitochondria, and some bacteria, allowing molecules up to the size of small proteins to pass through, are called **porins**.

### Final Answer:
The proteins are called **porins**.

---