Movement of substance across cell' membrane is controlled by the

Explanation

The question is asking about how substances move across the cell membrane and which factor controls this movement. The options provide different factors that could affect substance movement, and we need to choose the correct one. The cell membrane is a thin layer of molecules that surrounds the cell and separates the inside from the outside. It is a selectively permeable membrane, which means that it allows some substances to pass through while blocking others. The movement of substances across the cell membrane is crucial for the cell to function properly. The options given are the size of permeating particle, permeability of membrane, membrane proteins, size of permeating particle and membrane proteins, and all. The size of the particle and the presence of membrane proteins can affect substance movement, but the correct answer is the permeability of the membrane. Permeability refers to how easily a substance can pass through the membrane. A highly permeable membrane allows many substances to pass through, while a low permeability membrane restricts movement. The permeability of the cell membrane is controlled by the structure and composition of the membrane itself. In summary, the correct answer to the question is option B: permeability of membrane. This means that the ease with which substances pass through the cell membrane is determined by the permeability of the membrane. To learn more about this, please read the relevant sections of the recommended textbooks.