You Inject Radioactively Labeled Keratin Subunits into Cultured Skin Cells

Multiple Choice

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.