Researchers are studying deep-sea magnetotactic bacteria, which contain intracellular magnetite crystals that allow them to orient along Earth's magnetic fields. To analyze these nanometer-sized magnetosomes, they need to visualize both internal cellular structures and the elemental composition of the magnetite inclusions. Which microscopy technique is the BEST choice?

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Transmission electron microscopy (TEM) with energy-dispersive X-ray spectroscopy (EDS), for ultrastructural and elemental analysis

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Phase-contrast microscopy, to enhance contrast and study motility

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Scanning electron microscopy (SEM), for 3D visualization of bacterial surfaces

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Fluorescence in situ hybridization (FISH), for detecting gene expression in the bacteria

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Researchers are studying deep-sea magnetotactic bacteria, which contain intracel...

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