Question

multiple choice 1 point the active transport pump used to move sodium ions across the membranes of gill cells in a freshwater fish has each of the following characteristics except it has a specific binding site for atp. it uses osmosis to carry sodium ions into the cells. it is a protein. it has a specific binding site for sodium ions. it requires energy.

Explanation:

Active transport is a process that moves substances against their concentration gradient and requires energy (usually ATP). It involves specific proteins (carrier or pump proteins) with binding sites for the substances being transported. Osmosis is a passive process that involves the movement of water across a semi - permeable membrane, not the active transport of sodium ions. In the case of active transport of sodium ions in gill cells of freshwater fish, energy is used, there are specific binding sites for sodium ions on proteins, and proteins are involved. But it does not use osmosis to carry sodium ions into the cells.

Answer:

It uses osmosis to carry sodium ions into the cells.