The cell wall in plants and the cell membrane in animals and bacteria.
the cell membrane
cell membrane
The cell membrane controls what substances enter and leave the cell and at what rate it also separates the inside of the cell from its surroundings keeping the contense of the cell together and concentration gradients in place and don't forget it also contains receptors which allow messages to be convayed to cells.
The selective permeability, also called semi-permeability, of the membrane controls which substances cant enter and exit the cell.
cell membrane
selective permeability
Endocytosis
The cell membrane is the barrier that controls what substances enter and leave a cell.
The cell membrane controls what substances enter and leave the cell and at what rate it also separates the inside of the cell from its surroundings keeping the contense of the cell together and concentration gradients in place and don't forget it also contains receptors which allow messages to be convayed to cells.
IT depends on what cell. In the plant cell it is the cell wall and the cell membrane. But in the animal cell it is only the cell membrane.
the 3 parts of a cell are : 1 Nucleus- this controls what happens inside the cell . 2 Cell Membrane - this controls what substances enter and leave the cell 3 Cytoplasm - this is where the chemial processes occur
The cell membrane. It is described as semipermeable
The selective permeability, also called semi-permeability, of the membrane controls which substances cant enter and exit the cell.
cell membrane
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The cell membrane controls which substances can and cannot enter a cell.
selective permeability
selective permeability
The cell membrane is reposnible for allowing what substances can enter and leave a cell, this happens by different methods of transport for instance "active transport" in plants. The phospholipid bilayer containing cholesterol, proteins and carbohydrates, also helps in allowing which substances to pass.