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. It requires energy (usually in the form of ATP), involves a protein - based transport mechanism, and has specific binding sites for the substances being transported. Osmosis is a passive process and not involved in active transport.

Answer:

It requires energy.
It has a specific binding site for sodium ions.
It is a protein.