Question

Виписати властивості клітинної мембрани

Answer 1

Ответ:Важное свойство мембраны - избирательная проницаемость, или полупроницаемость, позволяет клетке взаимодействовать с окружающей средой: в нее поступают и вы водятся из нее лишь определенные вещества. Мелкие молекулы воды и некоторых других веществ проникают в клетку путем диффузии, частично через поры в мембране. В цитоплазме, клеточном соке вакуолей растительной клетки, растворены сахара, органические кислоты, соли

Answer 2

Properties of the Cell Membrane

The cell membrane, also known as the plasma membrane, is a vital component of all cells. It separates the internal environment of the cell from the external environment and plays a crucial role in maintaining cell integrity and regulating the movement of substances in and out of the cell. Here are some key properties of the cell membrane:

1. Selective Permeability: The cell membrane is selectively permeable, meaning it allows certain substances to pass through while restricting the movement of others. This property is essential for maintaining the internal balance of the cell and regulating the exchange of nutrients, ions, and waste products with the external environment.

2. Phospholipid Bilayer: The cell membrane is primarily composed of a double layer of phospholipids arranged in a bilayer. Each phospholipid molecule consists of a hydrophilic (water-loving) head and hydrophobic (water-repelling) tails. The hydrophilic heads face outward towards the aqueous environments, while the hydrophobic tails face inward, creating a barrier that separates the inside and outside of the cell.

3. Fluid Mosaic Model: The cell membrane is described by the fluid mosaic model, which suggests that it is not a rigid structure but rather a dynamic and flexible entity. The phospholipids and other molecules within the membrane can move laterally, allowing for membrane fluidity and the ability to change shape.

4. Proteins: The cell membrane contains various proteins that are embedded within the phospholipid bilayer. These proteins serve a range of functions, including transport of molecules across the membrane, cell signaling, and structural support. Some proteins span the entire width of the membrane (integral proteins), while others are attached to one side (peripheral proteins).

5. Cholesterol: Cholesterol molecules are interspersed within the phospholipid bilayer of the cell membrane. Cholesterol helps regulate the fluidity of the membrane and provides stability to the structure.

**6. Glycolipids