alleryStart learning →What does osmolarity measure?
AThe charge difference across the cell membrane
BThe total solute concentration of a solution
CThe rate at which water crosses a membrane
DThe number of aquaporins in a membrane
Answer & Solution
Correct answer: B. The total solute concentration of a solution
1. Osmolarity describes the total solute concentration of a solution.
2. A solution with low osmolarity has a greater number of water molecules relative to solute particles.
3. A solution with high osmolarity has fewer water molecules with respect to solute particles.
4. Osmolarity counts particles in solution, so it is not a rate, a charge or a protein count.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_
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