Which of the following is the primary function of the cell membrane?

Rationale: The cell membrane, also known as the plasma membrane, plays a crucial role in regulating the movement of substances in and out of the cell. It is selectively permeable, meaning it allows certain molecules to pass through while blocking others. This function is essential for maintaining the internal environment of the cell and ensuring that necessary nutrients can enter the cell while waste products and other substances can exit. While the cell membrane does provide some structural support for the cell, its primary function is to control the transport of substances. The synthesis of proteins and lipids primarily occurs in other cellular organelles such as the endoplasmic reticulum and Golgi apparatus, while storing genetic material is the function of the nucleus.
(a) To provide structural support for the cell: The cytoskeleton, a network of protein fibers, provides structural support for the cell.

(c) To synthesize proteins and lipids: The endoplasmic reticulum and Golgi apparatus are responsible for synthesizing proteins and lipids, respectively.

(d) To store genetic material: The nucleus is responsible for storing genetic material.