試題詳解

17. Which of the following statements about apoplastic phloem loading is FLASE?
(A) It is driven by a proton gradient.
(B) The mechanism is sucrose-proton co-transport.
(C) The sieve tube provides much of the energy for transport.
(D) In some cases. Active transport occurs across the plasma membrane of the sieve tube.
(E) In some cases. Active transport occurs across the plasma membrane of the companion cell. O