Anonymous
Jun 21
Cell membrane is considered as selectively preamble membrane. Give reason?
Biology
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ChatGPT
Jun 21
The cell membrane is considered selectively permeable because it allows only certain substances to pass through while blocking others. This selectivity is important for maintaining the internal environment of the cell and regulating the movement of molecules in and out of the cell. The cell membrane is made up of a phospholipid bilayer with embedded proteins that act as channels and transporters, controlling the passage of ions, nutrients, and waste products. This selective permeability helps the cell to maintain homeostasis and function properly.
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Google Gemini AI
Jun 21
The cell membrane is considered a selectively permeable membrane because it allows certain substances to pass through it while blocking others. This selective permeability is essential for the cell to maintain its internal environment and carry out its functions.
The cell membrane is composed of a phospholipid bilayer, which is a double layer of phospholipids. The phospholipids have a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail. The hydrophobic tails face each other in the center of the bilayer, while the hydrophilic heads face outward.
The hydrophilic heads of the phospholipids interact with water molecules, while the hydrophobic tails interact with nonpolar molecules. This arrangement creates a barrier that prevents water-soluble molecules from passing through the membrane. However, small nonpolar molecules, such as oxygen and carbon dioxide, can pass through the membrane easily.
In addition to the phospholipid bilayer, the cell membrane also contains proteins that help to regulate the passage of substances across the membrane. These proteins include channels, carriers, and pumps.
Channels are pores that allow certain ions or molecules to pass through the membrane. Carriers bind to specific molecules and transport them across the membrane. Pumps use energy to move molecules across the membrane against a concentration gradient.
The selective permeability of the cell membrane is essential for the cell to maintain its internal environment. The cell membrane helps to keep out harmful substances and maintain the proper concentrations of ions and molecules within the cell.
The cell membrane is composed of a phospholipid bilayer, which is a double layer of phospholipids. The phospholipids have a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail. The hydrophobic tails face each other in the center of the bilayer, while the hydrophilic heads face outward.
The hydrophilic heads of the phospholipids interact with water molecules, while the hydrophobic tails interact with nonpolar molecules. This arrangement creates a barrier that prevents water-soluble molecules from passing through the membrane. However, small nonpolar molecules, such as oxygen and carbon dioxide, can pass through the membrane easily.
In addition to the phospholipid bilayer, the cell membrane also contains proteins that help to regulate the passage of substances across the membrane. These proteins include channels, carriers, and pumps.
Channels are pores that allow certain ions or molecules to pass through the membrane. Carriers bind to specific molecules and transport them across the membrane. Pumps use energy to move molecules across the membrane against a concentration gradient.
The selective permeability of the cell membrane is essential for the cell to maintain its internal environment. The cell membrane helps to keep out harmful substances and maintain the proper concentrations of ions and molecules within the cell.
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