Which of the following statements is not correct concerning DNA and RNA?* 2 points
RNA contains the base uracil while DNA contains thymine.
Both DNA and RNA contain the base cytosine.
Both RNA and DNA are double-stranded molecules.
DNA contains a sugar named deoxyribose while RNA contains a sugar named ribose.

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.

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