Which of the following is not a function of membranous extensions like vesicles and tubules?

Options

A. Cell wall formation
B. Increase the surface area of the plasma membrane
C. Helps in protein synthesis
D. Helps in respiration

Answer

To solve the question "Which of the following is not a function of membranous extensions like vesicles and tubules?", we will analyze each option provided:

1. **Cell wall formation**: Membranous extensions such as vesicles and tubules do play a role in the formation of the cell wall. They help in the transport of materials necessary for building the cell wall. Therefore, this is a function of membranous extensions.

2. **Increase the surface area of the plasma membrane**: Membranous extensions like mesosomes can increase the surface area of the plasma membrane. This is beneficial for various cellular processes, including respiration and secretion. Hence, this is also a function of membranous extensions.

3. **Helps in protein synthesis**: Protein synthesis primarily occurs in the rough endoplasmic reticulum (RER), which is characterized by the presence of ribosomes. While vesicles can transport proteins, they do not directly participate in the synthesis of proteins. Therefore, this is not a function of membranous extensions.

4. **Helps in respiration**: Membranous extensions, particularly mesosomes, are involved in respiration by increasing the surface area available for respiratory processes. Thus, this is indeed a function of membranous extensions.

After analyzing all the options, we conclude that the correct answer is:

**C. Helps in protein synthesis** - This is not a function of membranous extensions like vesicles and tubules.