The Zamboni solution is suitable for which microscopy modalities?

• A. Light and Electron
• B. Light only
• C. Electron only
• D. None of the above

Answer: (A)

This question tests how a fixative can support both light microscopy and electron microscopy. Zamboni solution combines paraformaldehyde and glutaraldehyde in a buffered medium. The paraformaldehyde component provides good preservation of general cell structure and helps maintain antigenicity for light microscopy, while the glutaraldehyde component forms strong cross-links that excellent preserve ultra-structural detail needed for electron microscopy. Together, they create a fixative that preserves morphology well enough for LM and provides the ultrastructural fidelity required for EM, making it suitable for both modalities. The other options imply a limitation to one modality or none, but the mixed aldehyde fixative is specifically chosen to be compatible with both.