Stains used in electron microscopy such as phosphotungstenic acid and uranyl acetate are preferred over organic dyes because they ____________________, thus interact with the high-energy electrons more effectively.

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Stains used in electron microscopy, like phosphotungstic acid and uranyl acetate, contain heavy atoms. These heavy atoms are effective in scattering electrons, which is crucial for creating contrast in electron microscopy images. Organic dyes, which might work well for light microscopy by absorbing specific wavelengths of light, do not have the same effect under electron beams. The heavy atoms in these stains interact more effectively with the high-energy electrons, making them preferable for electron microscopy.

Stains Used in Electron Microscopy Such as Phosphotungstenic Acid and Uranyl