What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves?
A) an electrogenic pump
B) a proton pump
C) a contransport protein
D) A and C only
E) A, B, and C

Question

What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves? 
A) an electrogenic pump 
B) a proton pump 
C) a contransport protein 
D) A and C only 
E) A, B, and C

alphadxg · Answer

E - Cotransport relies on a pump as well as a cotransporter, by pumping H+ ions into the pump with sucrose.