Which components make up the cell structure?

The composition of a cell is fundamentally centered around protoplasm, which is the living substance within the cell that includes both the cytoplasm and the nucleus. The nucleus contains the cell’s genetic material and is essential for regulating activities and cell reproduction. The cytoplasm fills the space between the cell membrane and nucleus, where various organelles (like mitochondria and ribosomes) are suspended and carry out their functions.

The cell membrane is a critical component that surrounds the entire cell, providing structure and controlling what enters and exits the cell, thus contributing to the overall integrity and functionality of the cell. This combination of protoplasm, nucleus, cytoplasm, and cell membrane encapsulates the essential elements of cell structure, confirming why this answer is accurate.

In contrast, the other choices include elements that either represent specific organelles or do not capture the full structural integration seen in the cell's fundamental makeup. While options may list several important components of a cell, they do not collectively represent the foundational structure as clearly as the correct choice.