2. Suppose the Earth were flat, and the stars really were attached to a sphere that spun around the Earth. Think about travelling north until you were directly under Polaris. Would you expect
the same motions of the stars that someone at the north pole of a spherical Earth would see?

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Explanation:

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.