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: Silliness
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08-17-2011, 08:10 PM
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3597
Stitchawl
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Here's one;
The 'Building Blocks' of DNA are Adenine, Guanine, Cytosine, and Thiamine.
What is different about RNA? One of these 'blocks' changes. Which one, and what replaces it?
Stitchawl
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