Question

a solution is said to be isotonic if it contains ______.
more nonpenetrating solute particles than the interior of cells
the same number of nonpenetrating solute particles as the interior of cells
fewer nonpenetrating solute particles than the interior of cells

Explanation:

To determine the correct option, we recall the definition of an isotonic solution. An isotonic solution has the same osmotic pressure as the cell's interior, which is achieved when it has the same number of nonpenetrating solute particles as the cell's interior. The first option describes a hypertonic solution (more solute), and the third describes a hypotonic solution (fewer solute).

Answer:

B. the same number of nonpenetrating solute particles as the interior of cells