Studies of cricket Malpighian tubules revealed that potassium ions accumulated inside the tubule, moving against the potassium concentration gradient. Based on the information, which of the following is the best inference about the mechanism of potassium transport?
A) Potassium transport is a passive process.
B) Movement of potassium into the lumen of the Malpighian tubules is likely an energy-requiring process.
C) Potassium moves out of the tubules at a faster rate than it moves into the lumen of the tubules.
D) Sodium ions will follow potassium ions.
Correct Answer:
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