Cell size comparisons across biological domains:

• Typical bacterial and archaeal prokaryotic cells have a diameter/width in the range of $1\text{--}10\,\mu\text{m}$ (commonly $1\text{--}2\,\mu\text{m}$ for cocci/bacilli).
• $10\text{--}100\,\mu\text{m}$ is the characteristic size range of eukaryotic animal and plant cells.
• $1\text{--}10\text{ nm}$ represents molecular dimensions such as individual globular proteins, lipid bilayers ($4\text{ nm}$), or DNA diameter ($2\text{ nm}$).
• $10\text{--}100\text{ nm}$ represents viral particle diameters (e.g., poliovirus $30\text{ nm}$, influenza $80\text{--}120\text{ nm}$).

Methods for analyzing membrane architecture:

• Patch clamp technique measures electrical ion currents passing through individual membrane ion channels.
• FRAP (Fluorescence Recovery After Photobleaching) measures the lateral diffusion rate and mobility of membrane proteins or lipids, not their static physical distribution.
• Freeze-etching involves controlled sublimation of ice from the fractured surface to expose peripheral surface features.
• Freeze-fracture electron microscopy cleaves rapidly frozen biological membranes along the hydrophobic interior plane between the two lipid monolayers, revealing intramembrane protein particles (IMPs) embedded in the P-face and E-face, directly visualizing protein distribution and providing foundational proof for the Singer-Nicolson fluid mosaic model.