試題詳解

18. How does SPDT protein performs its function?
(A) It is a vacuolar transporter that store the phosphorus inside cells.
(B)It is a plasma-membrane transporter that load phosphorus into the xylem.
(C) It is a plasma membrane transporter that transport the phosphorus out of the xylem.
(D) It is a plasma membrane transporter that mediates phosphorus uptake into leaf cells.