One of the four nucleotide bases in DNA is replaced by a different base in RNA. Which base is it, and what is it replaced by?
A) cytosine, replaced by guanine
B) thymine, replaced by uracil
C) thymine, replaced by guanine
D) guanine, replaced by cytosine
E) adenine, replaced by uracil
Ans: B) thymine, replaced by uracil
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Fill in the blank(s) with the appropriate word(s).