Sequence symbols

Question # 1 of 20

 Base              Symbol       Complement 
 Adenine             A              T 
 Cytosine            C              G 
 Guanine             G              C 
 Thymine             T              A 
 Uracil              U              A 
 Inosine             I 
 Ambiguity symbols: 
 A or G              R              Y 
 C or T              Y              R 
 G or A or T or C    X or N         X 
What nucleotide in RNA corresponds to thymine in DNA? Enter the one-letter symbol.


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