Which three structures are found in all mammalian cells?

The correct answer focuses on the essential components that are universally found in all mammalian cells. The cytoplasm, nucleus, and cell membrane play critical roles in maintaining cellular structure and function.

The cell membrane, also known as the plasma membrane, serves as the barrier that defines the boundaries of the cell, controls the movement of substances in and out of the cell, and facilitates communication with other cells. This is crucial for the cell's interaction with its environment.

The nucleus is often referred to as the control center of the cell because it houses the genetic material (DNA) and is involved in regulating gene expression and cell division. All mammalian cells contain a nucleus, which is vital for the replication and function of the cell.

Cytoplasm, which includes the jelly-like fluid and the organelles within the cell, is the site where many cellular processes occur, including metabolic pathways and protein synthesis. It supports and suspends the organelles, ensuring that they function correctly.

In summary, the inclusion of the cytoplasm, nucleus, and cell membrane is essential to the definition of mammalian cells, as these components are fundamental to their survival and operation. While the other choices include elements that are important in various contexts of cellular biology, they do not represent structures