When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the ion?
A) plasma membrane ? primary cell wall ? cytoplasm ? vacuole
B) secondary cell wall ? plasma membrane ? primary cell wall ? cytoplasm ? vacuole
C) primary cell wall ? plasma membrane ? cytoplasm ? vacuole
D) primary cell wall ? plasma membrane ? lysosome ? cytoplasm ? vacuole
E) primary cell wall ? plasma membrane ? cytoplasm ? secondary cell wall ? vacuole
Answer: C
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