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∙ 2017-06-06 18:23:14PROTEIN!!!!!!!!!!!!!!!!!!!!!!!!!
Eldon Hilpert
Membrane transporter.
proteins
What you are considering when you are referring to how easily materials can pass through a membrane is how permeable the cell wall or membrane is.
The movement of water and dissolved materials through a cell membrane is called Osmosis.
The cells go through the cell's membrane
Membrane transporter.
Membrane transporter.
PROTEIN!!!!!!!!!!!!!!!!!!!!!!!!!
proteins
protein
PROTEIN!!!!!!!!!!!!!!!!!!!!!!!!!
Cell membrane
carrier proteins
carrier proteins
The structure of the plasma membrane consists of the phospholipid bilayer, which gives it a fluid structure, and not rigid, allowing the materials ease to pass through. Next, there are also integral proteins which can be thought of as 'tunnels', allowing the materials to come in and out. Then, there are peripheral proteins which also aid in getting the materials inside an out. On the cell membrane, there are receptors which recognize outside materials, and if they are really big, the cell engulfs these molecules through endocytosis [pinocytosis, and phagocytosis, which are basically for liquid molecules, and solid molecules]. This takes us back to the fluidity of the cell membrane. That's roughly how the cell membrane allows for the entering and exiting materials.
What you are considering when you are referring to how easily materials can pass through a membrane is how permeable the cell wall or membrane is.
Yes, materials move into the nucleus through pores in the nuclear membrane.