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A porous membrane has openings scattered on its surface of various size and frequency. This means that such membranes allow various substances to pass through. Any molecules that are larger than the membrane's openings will not pass through.
Wiki User
∙ 15y ago
Wiki User
∙ 16y agoIt means that the plasma membrane lets water through it. A plasma membrane is actually semipermeable, which means that certain molecules can pass through it by diffusion. Other molecules will be too big to pass through the membrane.
Wiki User
∙ 14y agoLook at the words - "selective" and "permeable".
What does 'selective' mean? You select what to eat - an apple or an orange; you select where to sleep - the bed or the floor; you select what movie to see.
So, selective means to have a choice between things.
Permeable, with respect to membrances, means allowing substances to go through.
In human terms, a DOOR is permeable, but a wall is not. [and technically speaking, sometimes a window is permeable]
So, if a membrane is "selectively permeable" this means that only some things can go in or out through the membrane.
We have many of these membranes in our bodies' cells - membranes that let sodium [Na+] ions in but not calcium [Ca+2] ions.
This is like a rock concert, and only some people have tickets to go in.
Wiki User
∙ 12y agoIt means the substance is able to pass through the membrane.
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What is the cell membrane like in real life?
People live in towns. People are multicellular organisms consisting of trillions of cells. Each cell has a cell membrane.
What are some non examples of a plasma membrane?
i would say tha some unexample of plasma membrane would be butts or boobies or maybe even penisis and vaginias ,but thats just my oppinion
What would happen to the membrane potential if a substance that makes the membrane permeable to ions is added to the cell?
If a subsance is applied to a cell that makes the membrane more permeable to ions, the interior voltage changes. If the interior voltage becomes more positive (say from Ð70 mV to Ð60 mV), this is called a depolarization. If the interior voltage becomes more negative (say from Ð70 mV to Ð80 mV) it's called a hyperpolarization.
What does is mean to say that a membrane is a fluid mosaic?
phospholipids and most proteins to drift about in the plane of the membrane
How does a visking tubing differ from a cellmembrane?
Visking tubing contains millions of tiny holes which only let small molecules, like water, diffuse through. Large molecules, such as starch, cannot cross the membrane. We say it is partially permeable (permeable means a substance is able to pass through). This is similar to a cell membrane. Visking tubing can therefore be used as a model of a cell.
What does it mean when scientists say that the cell membrane is selectivley permeable?
yes, it is
2 examples of partially permeable membranes?
A selectively permeable membrane is most often attributed to the cell membrane (plasma membrane) of cells. It is constructed of nonpolar phospholipids that will not dissolve many substances, like ions or large molecules. There are carrier proteins embedded in the membrane that allow only certain substances through.
Do eucharyotes have a plasma membrane?
Yes.
What is the cell membrane like in real life?
People live in towns. People are multicellular organisms consisting of trillions of cells. Each cell has a cell membrane.
What does it mean that biological memberanes are selectively permeable?
it means that any biological membrane allows only certain solute or we can say nutrients that are required by cell, to enter into cell through itself and not other unnecessary particles hrmful to cell.. Such property is called selectively permeable or semi permeable...
Is plasma membrane living?
plasma membrane is the membrane which surrounds the cells and the other organelle's so if it is non living it will not allow the imp. thing inside and the cells will die,..so i should say it living
What are some non examples of a plasma membrane?
i would say tha some unexample of plasma membrane would be butts or boobies or maybe even penisis and vaginias ,but thats just my oppinion
What would happen to the membrane potential if a substance that makes the membrane permeable to ions is added to the cell?
If a subsance is applied to a cell that makes the membrane more permeable to ions, the interior voltage changes. If the interior voltage becomes more positive (say from Ð70 mV to Ð60 mV), this is called a depolarization. If the interior voltage becomes more negative (say from Ð70 mV to Ð80 mV) it's called a hyperpolarization.
What are some non examples of a plasma?
i would say tha some unexample of plasma membrane would be butts or boobies or maybe even penisis and vaginias ,but thats just my oppinion
What does is mean to say that a membrane is a fluid mosaic?
phospholipids and most proteins to drift about in the plane of the membrane
Why does the cell membrane need to be semi-premable?
Semi-permeable means that which only allows certain things to pass through. The cell membrane needs to be semi permeable so that it only allows beneficial things (say, ions or water molecules) into the cell whilst keeping harmful things out (eg. toxins and viruses). That's all. Hope this helps you (:
How does a visking tubing differ from a cellmembrane?
Visking tubing contains millions of tiny holes which only let small molecules, like water, diffuse through. Large molecules, such as starch, cannot cross the membrane. We say it is partially permeable (permeable means a substance is able to pass through). This is similar to a cell membrane. Visking tubing can therefore be used as a model of a cell.
