Understanding FRET: Fluorescence Resonance Energy Transfer

What is the primary purpose of FRET in molecular biology?

• To identify the sequence of proteins

• To determine the molecular weight of proteins

• To analyze molecular interactions such as protein-protein interactions

• To measure the distance between two proteins

Which fluorophore is used to emit blue light in the FRET technique?

• YFP

• RFP

• GFP

• CFP

What is the maximum distance between proteins for FRET to occur?

• 5 nanometers

• 15 nanometers

• 20 nanometers

• 10 nanometers

What happens to YFP when proteins do not interact in FRET?

• YFP emits yellow light

• YFP does not emit light

• YFP emits green light

• YFP emits blue light

Which issue in FRET is caused by prolonged exposure to light?

• Cross-excitation

• Bleed-through

• Photobleaching

• Autofluorescence

What is autofluorescence in the context of FRET?

• Unwanted emission of light from fluorophores

• Natural fluorescence from cellular components

• Overlap of emission spectra

• Degradation of fluorophores

What is bleed-through in FRET experiments?

• Unwanted excitation of another fluorophore

• Natural fluorescence from cells

• Emission of light in the wrong channel

• Loss of fluorescence over time

What is the result of cross-excitation in FRET?

• Unwanted excitation of another fluorophore

• Natural fluorescence from cells

• Emission of light in the wrong channel

• Degradation of fluorophores

What indicates a successful FRET interaction between proteins?

• Emission of blue light from CFP

• Emission of yellow light from YFP

• No emission from YFP

• Emission of green light from GFP

What is the key takeaway regarding protein interaction detection using FRET?

• CFP must emit green light

• YFP must be directly excited

• Proteins must be more than 10 nanometers apart

• Proteins must be within 10 nanometers for energy transfer