Question

(7 of 19)
is the ability of a solution to affect the fluid volume in a cell, whereas
describes the number of particles of a solute in a solution.

tonicity; osmolarity
osmolarity; diffusion
osmolarity; molarity
tonicity; molarity
osmolarity; tonicity
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Explanation:

To solve this, we recall the definitions: Tonicity refers to a solution's ability to affect cell fluid volume (via osmosis). Osmolarity is the number of solute particles (osmoles) per liter of solution. Let's analyze each option:

• Option 1: Tonicity; osmolarity – Tonicity matches the first blank (affect cell fluid volume), osmolarity matches the second (number of solute particles).
• Option 2: Osmolarity; diffusion – Diffusion is a process, not about solute particle number. Eliminate.
• Option 3: Osmolarity; molarity – Molarity is moles of solute per liter, not particle number. Eliminate.
• Option 4: Tonicity; molarity – Molarity is not about particle number. Eliminate.
• Option 5: Osmolarity; tonicity – Reversed definitions. Eliminate.

So the correct pair is Tonicity (for affecting cell fluid volume) and Osmolarity (for solute particle number).

Answer:

A. Tonicity; osmolarity