Through studies on the Malpighian tubules, researchers found that K+ accumulated on the inner face of the tubule, against its concentration gradient. What can you infer about the mechanism of transport?
A) Potassium moves out of the tubules at a faster rate than it moves into the lumen of the tubules.
B) Movement of potassium into the lumen of the Malpighian tubules is an energy-requiring process.
C) Sodium ions will follow potassium ions.
D) Potassium transport is a passive process.
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