Ascientist is studying a cell and can clearly see that it has ribosomes and mitochondria. which statement best describes how the cell could be classified?
a) the cell is prokaryotic because it contains ribosomes.
b) the cell is prokaryotic because it contains mitochondria.
c) the cell is eukaryotic because it contains ribosomes.
d) the cell is eukaryotic because it contains mitochondria.

The cell studied by the scientist under the microscope contains both ribosomes and mitochondria. Both the prokaryotic and the eukaryotic cells contain ribosomes. However, the ribosomes in prokaryotes are 70S, while eukaryotes have 80S ribosomes. Nonetheless, they are present in both the cells. Their presence will not establish the classification of cells.

On the other hand, the mitochondria are present only in the eukaryotic cells. The prokaryotic cells contain no cell organelles and hence, have no mitochondria. The cell observed by the scientist contains mitochondria, hence, it is an eukaryotic cell.

Hence, the correct answer is 'Option D - The cell is eukaryotic because it contains mitochondria'.

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