You inject labeled keratin subunits into cultured skin cells. What happens a few minutes later?
A)The keratin subunits remain in the cytoplasmic keratin subunit pool.
B)Filaments become labeled at sites scattered throughout their length, rather than at their ends.
C)Filaments become labeled at both ends simultaneously.
D)Filaments become labeled at one end exclusively.
E)The entire intermediate filament network is quickly labeled.

Question

Quizplus · Accepted Answer

Keratin subunits incorporate into existing filaments at various points along their length, not just at the ends, due to the dynamic nature of intermediate filaments. This scattered incorporation leads to labeling at sites throughout the filaments rather than exclusively at the ends or uniformly across the network.

You Inject Labeled Keratin Subunits into Cultured Skin Cells