1. myosin is plentiful in muscle cells, but is not found at all in lens cells.
lens cells contain large amounts of crystallins, which are not found in
muscle cells. why do some proteins appear in one type of cell but not in
another?
during differentiation, certain genes are added to cells to produce proteins that
enable specific functions.
differentiated cells produce all proteins but destroy the proteins they do not
use.
differentiated cells release unused proteins into the blood for other cells to
use.
during differentiation, certain genes are activated to produce proteins that
enable specific functions.