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If you measure the amounts of the bases in any sample of dna, you'll find that

A) A = C and G = T
B) A = G and C = T
C) T = Aand C = G
D) A = U and C = G
E) U = C and A = G

User Sprigg
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C) T=A and C=G

This is called Chargaff’s rule. Because A and T basepair with each other in DNA, there should be an equal number of T and A in one sample (if there is a T on the top strand, there will be an A on the bottom strand). The same applies for C and G.
User Zstew
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