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12 December, 19:13

After the bases of DNA were identified, Erwin Chargaff analyzed the percentages of adenine, thymine, guanine, and cytosine in the DNA of many different organisms. This table shows the percentages of A, T, G, and C for a human, a bacterium, and a fish. Chargaff observed an approximate rule about these percentages in all of his samples: What is the rule?

A.

A + T = G + C

B.

A = G; T = C

C.

A = C; T = G

D.

A = T; G = C

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  1. 12 December, 19:20
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    D) A = T; G = C

    Explanation:

    Chargaff's rules state that "DNA from any cell of any organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine".

    This pattern is noticed in the DNA strands.
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