Question

< question 10 of 25 > transport proteins allow the movement of ions and small molecules across plasma membranes. identify the type of transport protein from each example as uniporter, symporter, or antiporter. a protein moves one ca²⁺ out of the cell and three na⁺ into the cell. uniporter symporter antiporter a protein allows ca to flow into a mitochondrion when bound by a ligand. a protein moves two na⁺ ions into the cell with one glucose molecule.

Explanation:

Uniporters move a single type of molecule. Symporters move two or more different molecules in the same direction. Antiporters move two or more different molecules in opposite directions. For the first example, since $Ca^{2 +}$ is moving out and $Na^{+}$ is moving in (opposite directions), it's an antiporter. For the second example, a single ion ($Ca^{2+}$) is moving into a mitochondrion, so it's a uniporter. For the third example, $Na^{+}$ and glucose are moving into the cell in the same direction, so it's a symporter.

Answer:

1. antiporter
2. uniporter
3. symporter