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Diffusion or if the molecules are too large they go through the transport proteins.
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∙ 13y ago
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What are membrane covered organelles?
this are organelles enclosed by a membrane
What are the advantages of semi permeability in cell membrane?
The membrane acts as a barrier that prevents most things from entering. Small molecules and water can diffuse across the membrane but most proteins and larger molecules cannot. The cell can use this advantage in combination with proteins to decide what gets in, what goes out and when that should happen.
What makes up most of a cell's membrane's?
Phospholipids is what makes up cell membranes. These are molecules with a polar head composed of a phosphate.
What particles are able to pass freely through a cell membrane?
This is unique to each cell. Some particles are small enough to diffuse freely in most cells. Other particles require varying types of transport mechanisms to cross the cell membrane. If it is a substance the cell either needs to take in or get rid of, there are proteins and other mechanisms to accomplish this. There are even actions of the cell in order to export or import substances.
What molecules form the double layer of cell membranes?
A double layer of phospholipids makes up most of your cell membranes
What is most likely to occur if the sugar molecules cross the membrane?
Sugar molecules move outside of the membrane.
The part of the cell that is in most direct contact with the environment is the?
The cell membrane, which surrounds the cell and is responsible for which molecules are allowed to diffuse into or out of the cell and which molecules are impermeable to the membrane
What is most likely to occur if the sugar molecules can cross the membranes?
Sugar molecules move outside of the membrane.
If water move into a cell and the cell swells what terms describe the environment inside the cell?
The concentration of a sugar is high inside a cell and slightly lower outside the cell what is most likely to occur if the sugar molecules can cross the membrane
What kinds of molecules pass through a cell membrane most easily?
small and hyrdophobic molecules
Is diffusion of molecules across the cell membrane the most complex type of active?
No, diffusion of molecules across a cell membrane is a passive process, not active, and arguably the least complex.
What are membrane covered organelles?
this are organelles enclosed by a membrane
The net movement of molecules into cells is most dependent upon?
selectivy of the cell membrane
How does CO2 cross the cell membrane?
No, carbon dioxide does not need a transport protein to cross the cell membrane. It can pass through a membrane by diffusion.
What controls which substances can move in and out of a cell?
The cell membrane regulates the movement of substances in and out of the cell.How does it do this? The phospholipid bilayer is impermeable to most substances, allowing across only small, uncharged molecules such as those of oxygen, carbon dioxide, and water. The only way for other substances to cross the membrane is via transport proteins (channel and carrier proteins). These are selective, and therefore control what enters and what leaves the cell.
What are the advantages of semi permeability in cell membrane?
The membrane acts as a barrier that prevents most things from entering. Small molecules and water can diffuse across the membrane but most proteins and larger molecules cannot. The cell can use this advantage in combination with proteins to decide what gets in, what goes out and when that should happen.
A cell membrane is a very specific about what it allows across. how does this help the cell?
The cell works better…
