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The implication of non-polar molecules diffusing more rapidly than polar molecules to the transport of substances through the plasma membrane is quite significant. Concentrate gradients are established which facilitate the transport of vital molecules.

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Can all molecules diffuse through all cell membranes?

No, not all molecules can diffuse through all cell membranes. The ability of a molecule to diffuse through a cell membrane depends on its size, charge, and solubility in lipids. Small, non-polar molecules can generally pass through the lipid bilayer of cell membranes via simple diffusion, while larger, polar molecules may require specific transport mechanisms.


How do water soluble molecules diffuse through biological membranes?

Water soluble molecules diffuse through biological membranes via facilitated diffusion, which involves the use of specific transport proteins embedded in the membrane. These proteins create channels or carriers that allow the molecules to pass through the hydrophobic interior of the membrane. This process is passive and does not require energy input from the cell.


What types of molecules diffuse through the cell membranes by facilitated diffusion?

Molecules that are charged or polar, such as ions, glucose, and amino acids, diffuse through cell membranes by facilitated diffusion. This process relies on carrier proteins or channel proteins to help facilitate the movement of these molecules across the membrane.


Do larger molecules diffuse more readily than smaller molecules?

No, smaller molecules generally diffuse more readily than larger molecules because they can move through pores and gaps in substances more easily due to their smaller size. This is why smaller molecules like oxygen and carbon dioxide can diffuse through cell membranes more quickly than larger molecules like proteins.


Which molecules are passively absorbed into the blood?

Small, non-polar molecules like oxygen, carbon dioxide, and water can passively diffuse through cell membranes and be absorbed into the blood. Lipid-soluble molecules and small uncharged molecules can also passively cross cell membranes to enter the bloodstream.


Which substance was able to diffuse through the cellophane?

The substance that can diffuse through cellophane is typically small, nonpolar molecules or water. For example, water can pass through cellophane membranes due to its small size and polar nature, while larger molecules like glucose or starch generally cannot. The permeability of cellophane depends on the size and polarity of the molecules involved.


Why don't starch molecules pass through partially permeable membranes?

Starch molecules are too large to pass through the pores of a partially permeable membrane. The size exclusion limit of the membrane restricts the passage of larger molecules like starch while allowing smaller molecules like water to pass through via osmosis.


Do lipid soluble molecules diffuse into a cell more rapidly than water soluble molecules?

Yes, lipid soluble molecules diffuse into a cell more rapidly than water soluble molecules. This is because the cell membrane is primarily made up of lipids, so lipid soluble molecules can easily pass through the lipid bilayer, while water soluble molecules need specific channels or transporters to facilitate their entry into the cell.


What is the substances diffuse fastest?

The substances that diffuse fastest are typically small, nonpolar molecules, such as oxygen and carbon dioxide. Their small size and lack of charge allow them to move easily through cell membranes and other barriers. Additionally, gases diffuse more rapidly than liquids or solids due to their lower density and higher kinetic energy. Temperature also plays a role, as higher temperatures increase the rate of diffusion for all substances.


Why does NaCl not require a transport protein for diffusion?

NaCl can diffuse freely across cell membranes through ion channels or transporters that allow for passive movement down its concentration gradient. As a small and simple molecule, NaCl does not require a specific transport protein for diffusion like larger or more complex molecules.


Which gas would diffuse most rapidly under the same conditions of temperature and pressure a large or a small one?

A small gas molecule would diffuse more rapidly than a large gas molecule under the same conditions of temperature and pressure because smaller molecules have higher average speeds and can move more easily through spaces between other molecules.


What type of molecules can permeate the plasma membrane?

Any molecule smaller than the holes in the membrane can pass through is the membrane is permeable. If the membrane is semi-permeable, then only molecules that the membrane selects can pass through. Electronegativity and existence of lipid layers are common selective traits for semi-permeable membranes.