The base compositions of four different nucleic acid samples

The base compositions of four different nucleic acid samples are shown in table 1: 1: A:35 T:- G:15 C:15 U:35 2: A:30 T20 G:30 C20 U- 3: A28 T28 G 22 C22 U- 4: 24 T- G22 C22 U18 Q: Sample #3 and sample #4 were obtained from the same organism found in the deep see off Madagascar. How is it possible that these two samples came from the same organism when the base compositions in the two samples are so different? (Do not invoke the presence of another organism, eg: visus)

Solution

since in a nucleic acidsamplewe do not have base composition from a single cell instead from multiple cells it could be that the quantitative amount of nucleic acids differ in sample 3 & 4 thus we get a different base composition , simply stating when we say nucleic acid sample we do not sample it from a single cells, the variation in quantity of nucleic acids and quality of nucleic acids could result in differing base composition in samples though both contain genomic dna from single organism ... also another reason could be technical error in nucleic acid extraction ....which lead to nucleic acid degradation in samples.............. hope it helps