Semi-permeability refers to the property of a membrane that allows certain molecules or ions to pass through, while restricting the passage of others. In semi-permeable membranes, the movement of molecules depends on their size, shape, and charge, as well as the properties of the membrane itself. For example, cell membranes are semi-permeable in nature, meaning they allow small molecules like oxygen and carbon dioxide, while restricting the passage of large molecules or ions.
Selective permeability, on the other hand, refers to a membrane that allows only specific molecules or ions to pass through, while preventing the passage of others. Selectively permeable membranes have specific transport proteins that allow the passage of particular molecules or ions based on their concentration or electrochemical gradient. For example, the plasma membrane of a nerve cell is selectively permeable, as it allows sodium ions to pass through the ion channels but prevents other ions like calcium and potassium from entering the cell.
In summary, semi-permeability allows some molecules to pass through, while selectively permeability allows only specific molecules to pass through. Semi-permeability is determined by the size and charge of molecules as well as the properties of the membrane, while selective permeability is determined by the presence of specific transport proteins on the membrane.
Semi-permeability refers to the property of a membrane that allows certain molecules to pass through while restricting others. It is a basic property of cell membranes and refers to their ability to allow only certain molecules or ions to pass through them. A semi-permeable membrane allows small, uncharged molecules such as oxygen, carbon dioxide, and water to pass through easily, while larger molecules, such as proteins, sugars, and ions, are unable to pass through or pass through very slowly.
On the other hand, selective permeability refers to the property of a membrane that selectively allows certain molecules or ions to pass through while actively excluding others. A selectively permeable membrane allows certain molecules or ions to pass through it while actively blocking others, based on the size, shape, charge, and chemical properties of the molecules or ions.
Selective permeability is more advanced than semi-permeability and is a property of more complex membranes such as cell membranes. Cell membranes are selectively permeable, which means that they allow certain molecules or ions to pass through while blocking others. The selectivity of cell membranes is due to the presence of specialized membrane proteins, such as transporters, channels, and pumps, that selectively bind to specific molecules or ions and transport them across the membrane.
In summary, semi-permeability is a basic property of membranes that allows certain molecules to pass through while restricting others based on their size and charge, while selective permeability is a more advanced property of membranes that selectively allows certain molecules or ions to pass through based on their size, shape, charge, and chemical properties.
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Semi-permeability refers to the property of a membrane that allows certain molecules or ions to pass through, while restricting the passage of others. In semi-permeable membranes, the movement of molecules depends on their size, shape, and charge, as well as the properties of the membrane itself. For example, cell membranes are semi-permeable in nature, meaning they allow small molecules like oxygen and carbon dioxide, while restricting the passage of large molecules or ions.
Selective permeability, on the other hand, refers to a membrane that allows only specific molecules or ions to pass through, while preventing the passage of others. Selectively permeable membranes have specific transport proteins that allow the passage of particular molecules or ions based on their concentration or electrochemical gradient. For example, the plasma membrane of a nerve cell is selectively permeable, as it allows sodium ions to pass through the ion channels but prevents other ions like calcium and potassium from entering the cell.
In summary, semi-permeability allows some molecules to pass through, while selectively permeability allows only specific molecules to pass through. Semi-permeability is determined by the size and charge of molecules as well as the properties of the membrane, while selective permeability is determined by the presence of specific transport proteins on the membrane.
Answer:
Semi-permeability refers to the property of a membrane that allows certain molecules to pass through while restricting others. It is a basic property of cell membranes and refers to their ability to allow only certain molecules or ions to pass through them. A semi-permeable membrane allows small, uncharged molecules such as oxygen, carbon dioxide, and water to pass through easily, while larger molecules, such as proteins, sugars, and ions, are unable to pass through or pass through very slowly.
On the other hand, selective permeability refers to the property of a membrane that selectively allows certain molecules or ions to pass through while actively excluding others. A selectively permeable membrane allows certain molecules or ions to pass through it while actively blocking others, based on the size, shape, charge, and chemical properties of the molecules or ions.
Selective permeability is more advanced than semi-permeability and is a property of more complex membranes such as cell membranes. Cell membranes are selectively permeable, which means that they allow certain molecules or ions to pass through while blocking others. The selectivity of cell membranes is due to the presence of specialized membrane proteins, such as transporters, channels, and pumps, that selectively bind to specific molecules or ions and transport them across the membrane.
In summary, semi-permeability is a basic property of membranes that allows certain molecules to pass through while restricting others based on their size and charge, while selective permeability is a more advanced property of membranes that selectively allows certain molecules or ions to pass through based on their size, shape, charge, and chemical properties.