Question

fill in the blank question
tem specimens are spread out in a thin film with either phosphotungstic acid or uranyl acetate in
staining.
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Explanation:

In Transmission Electron Microscopy (TEM), phosphotungstic acid and uranyl acetate are common negative stains; they deposit around the specimen (not on it) to create contrast by absorbing electrons, making the specimen appear light against a dark background.

Answer:

negative