Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

Which statement provides evidence for the theory that sucrose is actively loaded into companion cells?

  • AThe pH decreases in the cell wall of the companion cells compared with the cytoplasm.
  • BThe pH decreases in the cytoplasm of the companion cells compared with the cell wall.
  • CThe pH decreases in the companion cells and sieve tube elements.
  • DThe pH decreases in the sieve tube elements compared with the companion cells.

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