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A membrane that only allows certain substances to cross is called a selectively permeable or semi-permeable membrane. It allows some molecules or ions to pass through while blocking others based on characteristics like size, charge, or solubility.
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Why is a cell membrane called semi-permeable or selectively permeable?
A cell membrane is called semi-permeable or selectively permeable because it allows certain substances to pass through while restricting the passage of others. This selectivity is due to the presence of protein channels and carriers that regulate the movement of molecules in and out of the cell. It helps the cell maintain internal balance and carry out essential functions.
Is an ability of a plasma membrane to allow some substance to cross across the membrane more easily than others?
Yes, the ability of a plasma membrane to allow some substances to cross more easily than others is called selective permeability. This is due to the presence of specific transport proteins and channels that facilitate the movement of certain molecules while restricting others. The lipid bilayer of the membrane also plays a role in regulating which substances can pass through.
What is the membrane called if other substances besides water oxygen carbon dioxide and glucose are blocked from entering?
The membrane is selectively permeable if it only allows certain substances like water, oxygen, carbon dioxide, and glucose to pass through while blocking others based on size, charge, or other properties.
What is selective transport?
Selective transport refers to the movement of specific substances across a membrane, such as a cell membrane or an organelle membrane, through specialized transport proteins or channels. This process allows cells to regulate the passage of certain molecules in and out of the cell, maintaining internal homeostasis. Selective transport ensures that only certain molecules are allowed to cross the membrane, while others are excluded.
What feature of a membrane describes whether molecules can cross the membrane?
permeabiity
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 does a cell membrane have that makes it easier for certain molecules to cross the cell membrane?
Cell membranes have proteins like channel proteins and carrier proteins that facilitate the transport of certain molecules across the membrane. These proteins provide specific pathways for molecules to pass through, making it easier for them to cross the membrane. Additionally, some molecules can cross the membrane through simple diffusion if they are small and non-polar.
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.
What does the term selectively permable mean?
"Selectively permeable" refers to a membrane that allows certain substances to pass through while blocking others. This selectivity is based on the size, charge, or other properties of the molecules trying to cross the membrane. An example is a cell membrane, which permits the passage of specific molecules necessary for the cell's function while blocking others.
Why is a cell membrane called semi-permeable or selectively permeable?
A cell membrane is called semi-permeable or selectively permeable because it allows certain substances to pass through while restricting the passage of others. This selectivity is due to the presence of protein channels and carriers that regulate the movement of molecules in and out of the cell. It helps the cell maintain internal balance and carry out essential functions.
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
Is an ability of a plasma membrane to allow some substance to cross across the membrane more easily than others?
Yes, the ability of a plasma membrane to allow some substances to cross more easily than others is called selective permeability. This is due to the presence of specific transport proteins and channels that facilitate the movement of certain molecules while restricting others. The lipid bilayer of the membrane also plays a role in regulating which substances can pass through.
What is the definition of impermeable?
A membrane that lets all materials cross is permeable. A membrane that lets nothing cross is impermeable.
