Question

What transport substances to where they need to go
in the cell

Answer 1

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion

Step-by-step explanation:

Transport proteins generally perform two types of transport: “facilitated diffusion,” where a transport protein simply creates an opening for a substance to diffuse down its concentration gradient; and “active transport,” where the cell expends energy in order to move a substance against its concentration gradient