Astudent observes this cell under the microscope. he is discussing the structure indicated by the arrow with his lab partner. what would be the most likely classification of the cell pictured based on the structure they are observing? a) this cell is eukaryotic because it contains a nucleus. b) this cell is prokaryotic because it contains ribosomes. eliminatec) this cell is prokaryotic because it contains a nucleus with circular dna. d) this cell is eukaryotic because it contains membrane-bound organelles such as lysosomes and vacuoles.