DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar.
B) RNA is made up five bases, whereas DNA is made up of four.
C) RNA cannot exist as a double helix.
D) in general, RNA molecules are longer than DNA molecules.
E) All of these statements are true.
Answer: A
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a. 2
b. 3
c. 4
d. 5
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