Chapter 7

Last update by Babara on 09/08/2014
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The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions acrossthe plasma membrane. When the proteins of the pump are first synthesized in the rough ER, whatside 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 the orientation of proteins is scrambled in the

Golgi apparatus.

D) It doesn't matter, because the pump is not active in the ER.



Answer:

A) It will be on the cytoplasmic side of the ER.



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