Multiple Choice
Which of the following is the major positive ion (cation) found outside of cells?
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6. The Membrane
Introduction to Membrane Transport
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In the apoplastic route, ________.
A
transport occurs exclusively through active transport proteins in the plasma membrane
B
water and solutes move through the cell walls and intercellular spaces without crossing the plasma membrane
C
substances are transported only by vesicle-mediated endocytosis
D
water and solutes move directly through the cytoplasm via plasmodesmata
Verified step by step guidance1
Understand the concept of the apoplastic route: In plant cells, the apoplastic route refers to the movement of water and solutes through the cell walls and intercellular spaces without crossing the plasma membrane.
Compare the apoplastic route with other transport mechanisms: The symplastic route involves movement through the cytoplasm via plasmodesmata, while active transport requires proteins in the plasma membrane to move substances against their concentration gradient.
Eliminate incorrect options: Active transport proteins and vesicle-mediated endocytosis are not involved in the apoplastic route, as this pathway does not require crossing the plasma membrane.
Focus on the correct description: The apoplastic route is characterized by the movement of substances through the extracellular spaces and cell walls, bypassing the cytoplasm and plasma membrane.
Conclude the reasoning: Based on the definition and comparison, the correct answer is that water and solutes move through the cell walls and intercellular spaces without crossing the plasma membrane.
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