A cell observed under a microscope has circular DNA, 70S ribosomes, and chromatophores. The observed cell is
A
plant cell
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B
protist cell
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C
cyanobacterial cell
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D
mycoplasma cell
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Solution
The correct option is C cyanobacterial cell Circular DNA, 70S ribosomes are found in all prokaryotic cells. Chromatophores contain pigments that help in photosynthesis. Chromatophores are present in photosynthetic bacteria.
Mycoplasma is not photosynthetic bacteria. Cyanobacteria is a photosynthetic bacteria that contains chromatophores, hence the cell observed that was observed under the microscope is a cyanobacterial cell.
Plant cells and protist cells are eukaryotic cells that have linear DNA inside the nucleus and circular DNA inside organelles like mitochondria and chloroplasts. 80S ribosomes are present inside the eukaryotic cells.