Single answerDifficulty 3/5 · ChallengingOlympiadRepresenting dataArgumentation
Reading base compositions
Topic: Nucleic acids
In the style of Erwin Chargaff's analyses, a lab hydrolysed purified DNA from four sources into free bases and measured the percentage of each base. No uracil was detected in any sample. Measurement error is about ±0.5 percentage points.
Data
| Source | A (%) | T (%) | G (%) | C (%) |
|---|---|---|---|---|
| Human (liver) | 30.4 | 30.1 | 19.6 | 19.9 |
| Escherichia coli | 24.7 | 24.5 | 25.3 | 25.5 |
| Streptomyces (soil bacterium) | 14.2 | 14.0 | 35.9 | 35.9 |
| Virus X (a bacteriophage) | 24.5 | 32.5 | 24.0 | 19.0 |
Which conclusion is best supported by the data?
Answer every part to submit.