Question

The proteins and lipids, essential for building the cell membrane, are manufactured by:

• A. Rough endoplasmic reticulum
• B. Golgi apparatus
• C. Plasma membrane
• D. Mitochondira

Answer 1

Answer: (A), (B)

Golgi apparatus

The correct options are A and B.

Explanation of the correct option:

1. Cell membrane proteins are synthesized by the rough endoplasmic reticulum.
2. Lipids present in the cell membrane are synthesized by the Golgi apparatus and smooth endoplasmic reticulum.
3. Thus, plasma membrane lipids and proteins are synthesized by the endoplasmic reticulum both smooth and rough and Golgi apparatus by the process known as membrane biosynthesis.
4. Both categories of proteins are then translocated to their destination via specialized cellular cargo transport machinery.

Explanation of the incorrect option:

Option C:

1. The plasma membrane is responsible for allowing the entry and exit of particular metabolites only due to its selective permeability.
2. It also ensures cellular integrity.

Option D:

The mitochondria are responsible for energy production to cater to all energy requirements of the cell.

Final answer: The proteins and lipids, essential for building the cell membrane, are manufactured by rough endoplasmic reticulum and Golgi apparatus.