You inject radioactively 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 initially become labeled at scattered sites along their length.
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

When radioactively labeled keratin subunits are injected into cultured skin cells, filaments initially become labeled at scattered sites along their length within a few minutes. This is because the newly synthesized subunits are incorporated into the pre-existing intermediate filaments at various locations.

You Inject Radioactively Labeled Keratin Subunits into Cultured Skin Cells