Deoxyribonucleic acid (DNA) is a polymer of nucleotides with deoxyribose as their sugar. Aside from its sugar, nucleotides are also composed of a nitrogenous base and an inorganic phosphate group. The nitrogenous baases of these polymers may be the purines, adenine (A), and guanine (G), or the pyrimidines, cytosine (C), and thymine (T). DNA is widely known to be used as storage of genetic material. Relatively large multicelluar organisms, such as animals have DNA in the form of a double-stranded helix. The double-stranded form of DNA is made through a purine-pyrimidine complementary base pairing: A pairs with T and G pairs with C. Thus, a double-stranded DNA will have equal number of As and Ts, and equal number of Gs and Cs.
The base compositions of samples of genomic DNA from several different animals were given below. Which samples are likely to come from the same species? HINT: You should be able to identify 2 species (i.e. 2 pairs of samples) from the given data. Assume that only A, T G, and C are present in the DNA samples.
A. 27.3% T
B. 29.5% G
C. 13.1% C
D. 36.9% A
E. 22.7% C
F. 19.9% T
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