The Na+/Cl−/K+ Cotransporter in the Epithelial Cells of the Gills

question 32

Multiple Choice

The Na+/Cl−/K+ cotransporter in the epithelial cells of the gills of bony fishes is found ________.

• A) on the basolateral membrane of freshwater and marine fishes
• B) on the basolateral membrane of marine fishes and the apical membrane of freshwater fishes
• C) on the basolateral membrane of freshwater fishes and the apical membrane of marine fishes
• D) on the apical membrane of freshwater and marine fishes
• E) only in larval fish

---

Definitions:

Fixed Cost

Costs that do not vary with the level of production or sales, such as rent, salaries, or insurance.

Monthly Sales Volume

The total quantity of products or services sold by a company in a month.

Fixed Manufacturing Cost

Costs that do not vary with the level of production or sales, such as rent for factory premises, salaries of permanent staff, and depreciation of factory equipment.

Monthly Production Volume

The total count of units produced by a company in a month, reflecting the scale of its manufacturing operations.