Multiple Choice
Which molecule(s) shuttle(s) between the mesophyll and bundle sheath cells in C4 plants during carbon fixation?
A) A four-carbon molecule only
B) A three-carbon molecule only
C) A two-carbon molecule only
D) A four-carbon molecule and a three-carbon molecule
E) Two different four-carbon molecules
Correct Answer:

Verified
Correct Answer:
Verified
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