A chemical travels into a cell via a carrier protein. If that process required no ATP, what can you say about the relative concentration of the chemical inside and outside of the
cell?

Describe how an electric generator works

What are some characteristics of a free enterprise economy?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.