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Biology 2107 Exam II

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Question:

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?

Answer:
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 doesn't matter, because the pump is not active in the ER.
d)  It could be facing in either direction because proteins are properly reoriented in the Golgi apparatus.
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Last Updated By lshimel on 12/10/2011
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Biology 2107 Exam II
Biology 2107 Exam II
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Free Quiz Question From Biology 2107 Exam II
Question: 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?
Answer:
It will be on the cytoplasmic side of the ER.
It will be on the side facing the interior of the ER.
It doesn't matter, because the pump is not active in the ER.
It could be facing in either direction because proteins are properly reoriented in the Golgi apparatus.