What does the chemical formula CaCl2 show about the compound it represents? O It is made up of one element.
O It is made up of two.
O It is made up of three elements.
O It is made up of four elements.

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The answer is "O It is made up of two." Calcium and Chlorine make up the compound, despite there being two chlorine molecules and one calcium molecule.

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.