Cell Surface Molecules Are Labeled with a Fluorescent Tag and Then

Multiple Choice

Cell surface molecules are labeled with a fluorescent tag and then a portion of them are bleached with a laser beam.What would one observe after the cell is incubated for a few minutes?

A) The bleached molecules would disappear into the cell.
B) The bleached molecules would diffuse laterally through the membrane and intermix with unbleached molecules.
C) The bleached molecules would remain in the spot where bleaching occurred.
D) All the bleached molecules would flip-flop across the cell membrane.
E) The bleached molecules would be released from the cell.