Question

multiple choice question
during secondary active transport, when ions move opposite to the movement of a substance, this is termed ______.

• symport
• antiport
• uniport

Explanation:

To solve this, we analyze the terms:

• Symport: Molecules/ions move in the same direction.
• Antiport: Molecules/ions move in opposite directions.
• Uniport: Only one type of molecule/ion is transported.

The question states ions move opposite to the substance’s movement, so antiport fits.

Answer:

B. antiport