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The three terms used to compare a cell's osmolarity with its surroundings are hypotonic, hypertonic and:
AIsotonic
BIsomeric
CIsobaric
DIsotropic
Answer & Solution
Correct answer: A. Isotonic
1. The comparison has three possible outcomes: outside lower, outside higher, or the two equal.
2. Hypotonic covers lower and hypertonic covers higher.
3. Three terms, hypotonic, isotonic and hypertonic, are used to relate the osmolarity of a cell to that of the extracellular fluid.
4. So the equal case is isotonic.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_
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