Question 21 The image represents a human cell in an isotonic solutionSome common cellular molecules that can freely move across the plasma membrane are shown5 ATP O_{2} ATP C*O_{j} ATP O_{x}; C*O_{2}; H_{2}*O ATP human cell H_{2}*O; O_{j}; O_{2} What do you think will happen if no energy is used? Some leave the Ob Some H20 will enter the Some H20 will leave the cell Some 02 will enter the

Answer 1

In an isotonic solution, the concentration of solutes (like salts) is the same both inside and outside the cell, which means there is no net movement of water into or out of the cell.

In this specific scenario, if no energy is used, the following will happen:

• Some H2O will leave the cell
• Some H2O will enter the cell

However, since the solution is isotonic, the overall effect is that water will move in and out at equal rates, maintaining the cell's shape and volume. The key point is that as long as the solution remains isotonic, there won't be significant changes in the amount of water in the cell.

Regarding O2, it typically moves from areas of higher concentration to lower concentration via diffusion. Depending on the concentration of O2 inside the cell relative to outside, there may be movement of O2, but the specifics would depend on the exact concentrations present.

In summary, if the solution remains isotonic, water movement will be balanced, leading to no significant changes, and O2 can diffuse according to its concentration gradient.