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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.

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14y ago

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Why can oxygen easily cross the plasma membrane but sodium ions are unable to cross the plasma membrane?

Oxygen is a small, nonpolar molecule that can cross the plasma membrane via simple diffusion. Sodium ions, on the other hand, are charged and larger molecules that cannot easily pass through the hydrophobic interior of the plasma membrane. Sodium must rely on specific transport proteins like ion channels or pumps to cross the membrane.


Does egg albumin moves across a plasma membrane?

No, egg albumin is a large protein molecule that cannot pass through the plasma membrane on its own. It would require specific transport mechanisms, such as endocytosis or facilitated diffusion, to cross the membrane.


Does transported substances never physically cross the plasma membrane in endocytosis?

In endocytosis, transported substances are enclosed in vesicles formed from the plasma membrane, which do physically cross the plasma membrane. These vesicles then transport the substances into the cell.


What feature of a membrane describes whether molecule can cross the membrane?

permeabiity


Which molecule of a membrane describes whether molecules can cross the membrane?

permeability


How do glucose molecules cross a plasma membrane?

Facilitated Diffusion


What are the compounds find it difficult to cross the plasma membrane?

lipid and protien


What is a factor that determines of a molecule can cross a cell membrane?

Polarity


What process does oxygen and carbon dioxide use to cross the plasma membrane?

diffusion


What molecules can freely cross the plasma membrane?

Proteins, Carbohydrates, and Cholesterol. (Check out, 'fluid mosaic')


How water cross the plasma membrane?

I think it's cytoplasme, but I don't exactly know.


How many times does an oxygen molecule cross a plasma membrane when moving from inside an alveolus to the hemoglobin of a red blood cell and what are the plasma membranes?

When an oxygen molecule moves from inside an alveolus to the hemoglobin of a red blood cell, it crosses two plasma membranes. The first is the alveolar epithelium's plasma membrane, separating the alveolus from the capillary, and the second is the red blood cell's plasma membrane, where the oxygen binds to hemoglobin for transport. Plasma membranes are the outer boundary of cells that regulate the passage of substances in and out of the cell.