5. Ben's model boat weighs 4 newtons. When he places it in the water it sinks! Explain what happened and what he can do
to make the boat float.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

i think the answer is composed of atoms