In active transport, what do molecules do

Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells. ... Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.

Explanation:

you can have just about every answer you can think of

you know they are heterozygous for a trait because they have it as jj or jj.