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What membrane indicates how easy it is for substances to cross?
The membrane that indicates how easy it is for substances to cross is the cell membrane or plasma membrane. This selectively permeable membrane regulates the movement of ions and molecules in and out of the cell, allowing certain substances to pass while blocking others. Its permeability is influenced by factors such as lipid composition, protein channels, and the presence of transport mechanisms. Overall, the fluid mosaic model describes the dynamic nature of the cell membrane in facilitating or restricting substance movement.
What part of the membrane indicates how easy it is for substances to cross?
Permeability
What cell may transport a substance if the substance is too large to cross the membrane?
Vescicles
What molecules can freely cross the plasma membrane?
Proteins, Carbohydrates, and Cholesterol. (Check out, 'fluid mosaic')
How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside if the cell?
A polar substance can cross a cell's plasma membrane through facilitated diffusion, which does not require energy expenditure. In this process, specific transport proteins help the polar substance move down its concentration gradient from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached.
What membrane indicates how easy it is for substances to cross?
The membrane that indicates how easy it is for substances to cross is the cell membrane or plasma membrane. This selectively permeable membrane regulates the movement of ions and molecules in and out of the cell, allowing certain substances to pass while blocking others. Its permeability is influenced by factors such as lipid composition, protein channels, and the presence of transport mechanisms. Overall, the fluid mosaic model describes the dynamic nature of the cell membrane in facilitating or restricting substance movement.
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.
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.
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 process does oxygen and carbon dioxide use to cross the plasma membrane?
diffusion
What part of the membrane indicates how easy it is for substances to cross?
Permeability
What cell may transport a substance if the substance is too large to cross the membrane?
Vescicles
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.
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.
How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside if the cell?
A polar substance can cross a cell's plasma membrane through facilitated diffusion, which does not require energy expenditure. In this process, specific transport proteins help the polar substance move down its concentration gradient from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached.
