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31 August, 02:54

Chargaff's rule states that the amounts of guanine and cytosine are roughly the same, and the amounts of adenine and thymine are roughly the same

A. and the relative amounts of G+C and A+T don't vary by species

B. but the relative amounts of G+C and A+T vary by species

C. in eukaryotes only. the rule doesn't apply to prokaryotes.

D. except in species that use uracil in place of thymine in their DNA

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  1. 31 August, 03:36
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    Answer: B. but the relative amounts of G+C and A+T vary by species.

    Explanation: Chargaff's rule states a relantionship between guanine (G) and cytosinev (C) amounts and adenine (A) and thymine amounts (T). But these amounts could change across species, so much so, GC content is a characteristic of each species genome. For example, there some bacteria like Actinobacteria classified as " high GC bacteria", a plant Arabidopsis thaliana has 36% of GC content and others like Plasmodium sp. are classified as "high AT content".
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