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Which molecues cross the membrane of a cell easily and which do not?
Wiki User
∙ 11y ago
Non-polar molecules (such as fatty acids, steroid hormones and O2) pass freely through the cell membrane.
Small uncharged molecules (such as H2O) also pass freely, but are slower.
Large, polar molecules and ions (such as Na+ and K+) do not pass freely.
Macromolecules (such as proteins and polysaccharides) do not pass through the cell membrane.
Molecules and ions that cannot pass freely through the cell membrane rely on other means, such as protein transporters, to move in to the cell.
Wiki User
∙ 11y ago
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What depends on a molecule that can cross the plasma membrane?
The Gonhiqule depends on a molecule and cross the plasma membrane in an animal cell, but is a different story for the plant cell because of the cell wall.
What kinda ions are positively charged and can cross back and forth across the neuron cell membrane?
There are two ions that can cross the cell membrane. The positively charged sodium and potassium ions can cross back and forth across the neuron cell membrane.
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
What receptor has a ligand that can cross the cell membrane that binds?
Intracellular
What are you considering when you referring to how easily materials can pass through membrane?
What you are considering when you are referring to how easily materials can pass through a membrane is how permeable the cell wall or membrane is.
What ions are positively charged and can cross back and forth across neuron and cell membrane?
There are two ions that can cross the cell membrane. The positively charged sodium and potassium ions can cross back and forth across the neuron cell membrane.
Which particles-starch or Lugol's-were able to cross the model cell membrane?
The particles that were able to cross the model cell membrane was the Lugol's solution.
Why can oxygen diffuse across a cell but a protein cannot?
Oxygen is much smaller than a protein.proteins are too largeDifference in size
What depends on a molecule that can cross the plasma membrane?
The Gonhiqule depends on a molecule and cross the plasma membrane in an animal cell, but is a different story for the plant cell because of the cell wall.
What kinda ions are positively charged and can cross back and forth across the neuron cell membrane?
There are two ions that can cross the cell membrane. The positively charged sodium and potassium ions can cross back and forth across the neuron cell membrane.
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
What is selectively permeable?
The property of a membrane or other material that allows some substances to pass through it more easily than others.Selective permeability refers to the control that a cell membrane has in terms of what it allows to cross it. This gives the cell membrane the ability to choose which molecules enter or leave.
Why can co2 and o2 cross the phospholipid bilayer without help from proteins?
O2 and CO2 are both nonpolar molecules, therefore they can easily pass through the hydrophobic interior of a membrane.
What type of molecules can easily go through your cell membrane or are permeable to the cell membrane?
Substances with a hydrophillic-lipophillic balance are permeable through the cell membrane.
What types of molecules can easily go through your cell membrane are permeable to the cell membrane?
Substances with a hydrophillic-lipophillic balance are permeable through the cell membrane.
What is it when ions are in a low concentration outside a cell and they slowly cross the membrane into the cell?
the answer is the membrane are probably broken down
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.
