The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on?
A) It will be on the cytoplasmic side of the ER.
B) It will be on the side facing the interior of the ER.
C) It could be facing in either direction because proteins are properly reoriented in the Golgi apparatus.
D) It doesn't matter, because the pump is not active in the ER.
Modifications that occur at the ends of mRNA in eukaryotic cells.
The arrangement of cells in the retina.
Nurse bees tending to brood in cells both open and capped with beeswax.
Iron-deficient red blood cells.
A schematic diagram of the functional cycle of the Na+–K+ pump