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A significant advancement in cellular research occurred with the invention of an electron microscope that offers high resolving power, enabling the observation of detailed structures within cell organelles.

1. Transmission electron microscope (TEM)
2. Scanning electron microscope (SEM)
3. Reflection electron microscope (REM)
4. An electron microscope utilizes electron beams and their wave properties to magnify objects, unlike an optical microscope that relies on visible light.

Correct answer: Transmission electron microscope (TEM)

Solution

The transmission electron microscope (TEM) was a major breakthrough in cell studies as it provides high resolution and allows visualization of ultrastructures of cell organelles.

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