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What is a membrane called when only certain things can cross a membrane?
Wiki User
∙ 13y ago
a membrane that only allows certain things to cross is called "selectively permeable"
Wiki User
∙ 13y ago
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Why is a cell membrane called semi-permeable or selectively permeable?
As the cell membrane only allows certain substances to enter or leave the cell, meaning that while it IS permeable (as some substances can cross it), it is only selectively as not all substances are able to cross it, only some.
Why can oxygen easily cross the plasma membrane but sodium ions are unable to cross the plasma membrane?
Gh
What is the membrane called if other substances besides water oxygen carbon dioxide and glucose are blocked from entering?
A semi-permeable membrane. Does cross - membrane transit of glucose need active transport,
What properties does a selective permeable membrane have?
the ability to allow materials to cross a membrane
What is a transport protien?
YO ITS JOJO HERE myspace.com/ILOVEHALO3GUY A transmembrane protein that helps a certain substance or class of closely related substances to cross the membrane
Why is a cell membrane called semi-permeable or selectively permeable?
As the cell membrane only allows certain substances to enter or leave the cell, meaning that while it IS permeable (as some substances can cross it), it is only selectively as not all substances are able to cross it, only some.
What is the function (job) of lipids?
That is just another name for the cell membrane. It's main job is to keep the things that are on the inside of a cell inside, and keep what things are outside the cell on the outside. It is also called a semipermeable membrane because it can allow some things, under certain situations, to cross the phospholipid bilayer to enter or exit the cell.The phsopholipid bilayer is the thin polar cell membrane comprised of two layers of lipids. This membrane surrounds a cell to keep substances (ions, proteins, etc) in or out of the cell, but also allow selected substances to pass through the cell membrane as required.
How membrane is selectively permeable?
means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell
What helps to allow materials to cross the plasma membrane?
Integral proteins - proteins which span the width of the membrane. This can be things such as channels and pumps.
How does nutrients cross plasma membrane?
Things like oxygen, CO2 and lipids cross the membrane with simple diffusion. Water can cross the membrane with osmosis when the water moves through a channel protein in the plasma membrane. Glucose, potassium, sodium etc. moves through a carrier protein in the membrane with the process of active movement. In the process of active movement energy is needed and it is given by the glucose or ATP from the cell.
What is a thin sheet of materials that selectively aloows certain molecules to cross but prevents others from crossing?
Semi-permeable membrane
What can move across the plasma membrane freely by diffusion without the help of a transmembrane protein?
Water and small, non-polar molecules can cross the membrane without transport proteins. The process of this automatic movement is called diffusion; the diffusion of water specifically is called osmosis.
The proccess by which a protein channel allows molecules to cross the cell membrane is called?
Facilitated diffusion
What needs to get into the cell and cross the cell membrane?
Oh things like food, oxygen, ions, and even hormones.
How is the membrane permeability?
means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell
Why can oxygen easily cross the plasma membrane but sodium ions are unable to cross the plasma membrane?
Gh
What membrane do protons cross in the synthesis of ATP?
the messianinic membrane
