Briefly discuss your understanding to passive and active transport and draw how does it happen in a cell. ?
Explain what is osmosis, draw and briefly discuss what will happen in a cell in a hypotonic, hypertonic and isotonic solution?
Answers
Answer:
Active transport requires energy for the movement of molecules but in the case of passive transport, it does not require energy for the movement of molecules.
Osmosis is the special case of diffusion. it is the movement of water from higher concentration of water to lower concentration region of water across semi-permeable membrane.
• If the medium surrounding the cell has a higher water concentration than the cell, meaning that the outside solution is very dilute, the cell will gain water by osmosis. Such a solution is known as a hypotonic solution. Water molecules are free to pass across the cell membrane in both directions, but more water will come into the cell than will leave. The net (overall) result is that water enters the cell. The cell is likely to swell up.
• If the medium has exactly the same water concentration as the cell, there will be no net movement of water across the cell membrane. Such a solution is known as an isotonic solution. Water crosses the cell membrane in both directions, but the amount going in is the same as the amount going out, so there is no overall movement of water. The cell will stay the same size.
• If the medium has a lower concentration of water than the cell, meaning that it is a very concentrated solution, the cell will lose water by osmosis. Such a solution is known as a hypertonic solution.