Living Cells are Separated from the Outside Environment by a Flexible

Question

Living cells are separated from the outside environment by a flexible
A)nucleus.
B)membrane.
C)cell wall.
D)DNA circle.

Accepted Answer

Living cells are separated from the outside environment by a flexible membrane known as the plasma membrane or cell membrane. The membrane is composed of phospholipids, proteins, and carbohydrates and regulates the entry and exit of substances into and out of the cell. The nucleus contains the cell's genetic material and is enclosed by a nuclear membrane, but it does not serve as the primary barrier between the cell and its environment. Some cells also have a cell wall, which provides additional structural support and protection, but it is not flexible and does not regulate the transport of substances in and out of the cell. DNA circles are found in some prokaryotic cells, but they do not serve as a membrane or barrier separating the cell from the environment.