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∙ 11y ago
Materials that can cross the cell membrane include small non-polar molecules like oxygen and carbon dioxide, as well as small polar molecules like water. These molecules can freely pass through the lipid bilayer of the membrane due to their small size and compatibility with the hydrophobic environment of the lipid tails. However, larger molecules and charged ions require specific protein channels or transporters to cross the membrane.
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Where does the materials needed by cells come from?
They cross the cell membrane from the environment.
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.
Why must the cell membrane be selective in its permeability?
this means that it allows some materials, but not all, to cross it, or permeate it.
What membrane do protons cross in the synthesis of ATP?
the messianinic membrane
Do ions and other small water-soluble materials cross the cell membrane only by passing through the channels?
Im pretty sure this is a yes.
What type of membrane allows some but not all materials cross?
A selectively permeable membrane allows SOME but not ALL materials to cross.
What is the definition of impermeable?
A membrane that lets all materials cross is permeable. A membrane that lets nothing cross is impermeable.
Where does the materials needed by cells come from?
They cross the cell membrane from the environment.
How do materials get in and out of the cell?
Some materials cross the cell membrane by diffusion. Some cross through channels. Some bind to receptors and are actively transported.
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.
What is there past tense of cross?
The past tense of "cross" is "crossed."
Why must the cell membrane be selective in its permeability?
this means that it allows some materials, but not all, to cross it, or permeate it.
What is the past tense of the word cross?
The past tense of the word "cross" is "crossed."
What is a thin sheet of materials that selectively aloows certain molecules to cross but prevents others from crossing?
Semi-permeable membrane
Is crossed a verb?
The word crossed in the past tense of the verb to cross. He crossed the street.
What substance crossed the dialysis membrane?
Cells have methods other than diffusion/osmosis to move materials across the cell membrane, most of which involve membrane proteins and require the use of energy. The cell membrane also performs functions other than controlling the movement of materials into and out of the cell, and the membranes of some specialized cells have very complex functions. So we can see that the cell membrane is a very intricate and important component of the cell.
What is the past tense of cross?
Crossed
