Which statement best describes the plasma membrane of a living plant cell?
Responses
It is multi-layered and composed of only proteins and carbohydrates.
It is multi-layered and composed of only proteins and carbohydrates.
It controls which substances enter and exit the cell.
It controls which substances enter and exit the cell.
It allows all substances to enter and exit the cell.
It allows all substances to enter and exit the cell.
It is a double protein layer containing floating molecules of lipids.
It controls which substances enter and exit the cell.
The correct statement that best describes the plasma membrane of a living plant cell is: It controls which substances enter and exit the cell.
The statement that best describes the plasma membrane of a living plant cell is:
"It controls which substances enter and exit the cell."
To understand why this statement is correct, we can refer to the structure and function of the plasma membrane. The plasma membrane is a thin, flexible boundary that surrounds the cell. It is composed of a phospholipid bilayer, which consists of two layers of phospholipid molecules. Each phospholipid has a hydrophilic (water-loving) head and hydrophobic (water-fearing) tails.
The arrangement of these phospholipids forms a selectively permeable barrier, allowing certain substances to pass through while preventing the movement of others. Other components, such as proteins and carbohydrates, are also present in the plasma membrane, serving various functions like transportation, cell signaling, and cell recognition.
Thus, the plasma membrane of a living plant cell controls which substances enter and exit the cell, ensuring that the cell maintains its internal environment and regulates its interactions with the external environment.