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What substance is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
Nonpolar molecules like lipid-soluble substances (e.g., steroid hormones, oxygen, and carbon dioxide) are most likely to passively diffuse across the plasma membrane by dissolving in the lipid bilayer. This type of diffusion does not require a specific transport protein and can occur directly through the phospholipid bilayer due to the molecules' hydrophobic nature.
How do steroids move across the cell membrane?
Steroids can diffuse across the cell membrane due to their lipid-soluble nature. They pass through the phospholipid bilayer of the membrane and bind to specific steroid hormone receptors inside the cell. These receptors then regulate gene expression and trigger various cellular responses.
What parts of the plasma membrane are water soluble?
The plasma membrane is made of phospholipids. Phospholipids contain a hydrophillic head group which is considered water soluable. They also contain a hydrophobic tail group whichi s considered lipid soluable
Why can molecules that are fat-soluble permeate across a cell membrane?
Cell membranes are composed of a lipid bilayer. Cellular fluid (cytosol) and the cell's organelles are contained by the cell's membrane, which is composed of a lipid bilayer. Lipids are a type of fat. Because a cell's membrane is composed of fat, only fat-soluble molecules are able to dissolve through the membrane into the cytosol.
Which of the following statements about a typical plasma membrane is correct?
The correct statement about a typical plasma membrane is that it is composed of a phospholipid bilayer with embedded proteins. This structure allows the plasma membrane to regulate the passage of molecules in and out of the cell, maintain cell shape, and interact with other cells and the external environment.
What is the Plasma membrane lipid that improves the rigidity of the plasma membrane and increases the membrane's impermeability to water?
Cholesterol is the plasma membrane lipid that improves rigidity and reduces permeability to water due to its ability to pack tightly between the phospholipid molecules, increasing membrane stability.
What is a holes in plasma membrane through which molecules pass across capillary wall?
The plasma membrane is made up of a lipid bilayer and some proteins. The transmembrane proteins are the structures which are involved in the transport of molecules in or through the cell.
Can the lipid pass through the cell membrane?
yes. Lipid soluble substances are highly permeable
Why do drugs need to be soluble in oil?
Drugs need to pass into the lipid-cell membrane of cell. to do this they need to be lipid soluble. olis are lipids.
What moves small or lipid soluble solutes through the membrane?
Small or lipid soluble solutes can pass through the cell membrane via simple diffusion. This process occurs without the need for energy or specific transport proteins, as these solutes can move freely through the lipid bilayer of the membrane due to their size or lipid solubility.
What is nitrous oxide gas molecules diffusing across a cell's plasma membrane?
Nitrous oxide gas molecules can diffuse across a cell's plasma membrane through simple diffusion, moving from an area of higher concentration to an area of lower concentration without the need for a carrier protein. The small size and non-polarity of nitrous oxide allow it to pass directly through the lipid bilayer of the membrane.
What stuctural features of the plasma membrane contribute to its semipermeability?
lipid bilayers
