The research by Michael Sussman showed that a gene called SUC2 is expressed in vascular tissue, encoding a proton-sucrose symporter. Mutant plants lacking a functional SUC2 gene were unable to ________.
A) export sugar from mesophyll cells to the rest of the plant
B) accumulate starch in plant chloroplasts
C) load sucrose into mesophyll cells
D) carry out facilitated diffusion
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