In an experiment the proteins in the cell surface membrane of a living cell were labelled with a fluorescent dye.
A small area of the membrane was observed using a microscope. A laser was then used to permanently destroy the fluorescence of the dye molecules in this field of view.
The fluorescence in this field of view was later seen to return.
What does this experiment show?
1 )
Proteins are found only on the outer surface of cell surface membranes.
2 )
Proteins in the outer layer of a bilayer do not penetrate into the inner layer.
Proteins move freely in the phospholipids of a bilayer.
4 )
The cell surface membrane of the cell is a bilayer.
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