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Analyze the data about nitrogenous base content of DNA from various species. Percentages of Bases in Five Organisms Source of DNA A T G C Streptococcus 29.8 31.6 20.5 18.0 Yeast 31.3 32.9 18.7 17.1 Herring 27.8 27.5 22.2 22.6 Human 30.9 29.4 19.9 19.8 E. Coli 24.7 23.6 26.0 25.7 Which of these statements are supported by the data? Select all that apply. A. In any one species, the amount of adenine closely approximates that of thymine. B. In any one species, the amount of guanine closely approximates that of cytosine. C. The amounts of A, T, G, and C in DNA is constant across species. D. The amounts of A, T, G, and C in DNA varies from species to species.

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Oseni

Going by what is obtainable from the data, the amount of A, T, G, and C in DNA can be said to be constant across species.

  • For Streptococcus: 29.8+31.6+20.5+18.0 = 99.9
  • For yeast: 31.3+32.9+18.7+17.1 = 100
  • For Herring: 27.8+27.5+22.2+22.6 = 100.1
  • For E. coli = 24.7+23.6+26.0+25.7 = 100

Hence, one can see that the sum of all the nitrogenous bases in the DNA of each of the species studied is relatively constant with very minimal variation.

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