An element's atomic number is 36. how many protons would an atom of this element have?

36 protons

The atomic number is the number of protons in an atom of an element.

the correct answer is b

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.