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20 July, 00:58

A double-stranded DNA molecule is separated into its constituent strands, and the strands are separated in an ultracentrifuge. In one of the strands the base composition is 22% A, 30% T, 20% G, and 28% C. What is the base composition of the other strand?

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  1. 20 July, 04:35
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    22% T, 30% A, 20% C, and 28% G

    Explanation:

    Two strands of double-stranded DNA molecules are held together by hydrogen bonds formed between the complementary bases. Adenine and thymine are bonded together by two hydrogen bonds. Similarly, cytosine and guanine form a base pair. Therefore, if one strand of a double helix DNA has 22% A, 30% T, 20% G, and 28% C, the other strand would have the following composition:

    22% A: 22% T

    30% T: 30% A

    20% G: 20% C

    28% C: 28% G

    This is also called the Chargaff rule.
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