What are the special structures in the cell membrane that allow water and sugar pass through it made of?
These special structures are called protein gates or protein channels. Water is able to diffuse through the cell membrane since it is a small molecule. However, there are channels called aquaporins that allow water to enter the cell. A glucose molecule cannot just diffuse into a cell. There are glucose channels on the surface of the cell membrane that bind glucose molecules and allow them to enter the cell.
What are special structures in cell membrane that allow material such as water and sugar to pass through made of?
What are the special structures in the cell membrane that allow materials such as water and sugar to pass through made o?
Yes, how else could the cell live. Cell membranes have structures (holes) in them to allow things to move in and out. These holes are special structures in the membrane and they "control" what goes across the membrane. I have made a link below to a diagram of the cell membrane to show some of these structures.
A lot of proteins are embedded in a cell's plasma membrane. Some of them have a channel-resembling structure which allows specific ions to pass through. Moreover, some other proteins have more complex structures enabling them to bind ions on the one side of the membrane and, through a change of configuration, to release them on the other.
No. The cell wall is made of a stiff material which protects the cell and keeps its shape regular. It is usually composed of a complex carbohydrate. The cell membrane is a thin partially-permeable layer of phospholipids surrounding the cytoplasm which controls the movement of substances in and out of the cell. It does not allow bigger molecules such as the other structures of the cell to move out of the cell except through special…
selectively permeable membranes allow some substances to pass through them and others not. when you pour boiled vegetables into a strainer to drain them, the water passes through the holes but the vegetables do not as they do not fit. This acts similarly to a selecively prmeable membrane (such as the cell membrane) because this kind of membrane will allow some chemicals to pass through it but not all.
A membrane that is "selectively permeable" will allow some molecules and ions to pass through easily (by diffusion or facilitated diffusion), but not others. A membrane may be semipermeable for many reasons - molecule size (small pores can allow small, but not large, molecules to pass through), solubility in the membrane (for instance, fat-soluble molecules can pass through a lipid membrane), or other factors.
How and why are embedded transport proteins selective of the molecules they allow through the phospholipid membrane?
I semi-permeable membrane is a membrane when only certain substances can pass through it. it is a membrane that will only allow certain molecules through it . in general oxygen , food and water are allowed to enter ; waste products are allowed to exit and harmful substances are kept out. hope this helps.