To investigate the properties of cell membranes, a scientist used the Fluorescence Recovery After Photobleaching (FRAP) technique. Based on this method, all the membrane proteins on the cell surface are to be uniformly labeled with a green fluorescent dye. After 10 minutes, a small area on the cell membrane will be photo-bleached by shining a powerful laser at it (this laser permanently destroys the fluorescent molecules in the area). The fluorescence in the photobleached area will be measured over time. Which of the below statement/s is supported by this observation? (Mark all that apply/more than one answer is accepted) Nucleoli Nucleus containing GFP-POL Prebleach T-O sec a Laser bleaching T-3 sec 0 Fluorescence recovery after bleaching T-3 sec until end of measurement 50 100 150 Time[sec] 200 250 300 O a. The cell membrane is fluid, allowing proteins from adjacent areas to move into the photobleached area O b. New proteins are synthesized in the cell and transported to the cell surface O c. Fluorescent molecules are not permanently destroyed by the laser beam. They can spontaneously regain their fluorescence over time. Od. The rate of fluorescent recovery is directly related to the rate of protein diffusion

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To investigate the properties of cell membranes, a scientist used the Fluorescence Recovery After
Photobleaching (FRAP) technique. Based on this method, all the membrane proteins on the cell
surface are to be uniformly labeled with a green fluorescent dye. After 10 minutes, a small area on
the cell membrane will be photo-bleached by shining a powerful laser at it (this laser permanently
destroys the fluorescent molecules in the area). The fluorescence in the photobleached area will be
measured over time. Which of the below statement/s is supported by this observation?
(Mark all that apply/more than one answer is accepted)
Nucleoli Nucleus containing
GFP-POI
Prebleach
T-O sec
S
Laser bleaching
T-3 sec
0
50
Fluorescence recovery after bleaching
T-3 sec until end of measurement
100 150 200 250 300
Time[sec]
O a. The cell membrane is fluid, allowing proteins from adjacent areas to move into the photobleached area
O b. New proteins are synthesized in the cell and transported to the cell surface
O c. Fluorescent molecules are not permanently destroyed by the laser beam. They can spontaneously regain
their fluorescence over time.
Od. The rate of fluorescent recovery is directly related to the rate of protein diffusion
Transcribed Image Text:To investigate the properties of cell membranes, a scientist used the Fluorescence Recovery After Photobleaching (FRAP) technique. Based on this method, all the membrane proteins on the cell surface are to be uniformly labeled with a green fluorescent dye. After 10 minutes, a small area on the cell membrane will be photo-bleached by shining a powerful laser at it (this laser permanently destroys the fluorescent molecules in the area). The fluorescence in the photobleached area will be measured over time. Which of the below statement/s is supported by this observation? (Mark all that apply/more than one answer is accepted) Nucleoli Nucleus containing GFP-POI Prebleach T-O sec S Laser bleaching T-3 sec 0 50 Fluorescence recovery after bleaching T-3 sec until end of measurement 100 150 200 250 300 Time[sec] O a. The cell membrane is fluid, allowing proteins from adjacent areas to move into the photobleached area O b. New proteins are synthesized in the cell and transported to the cell surface O c. Fluorescent molecules are not permanently destroyed by the laser beam. They can spontaneously regain their fluorescence over time. Od. The rate of fluorescent recovery is directly related to the rate of protein diffusion
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