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Question
Calcium ions (Ca2+) are present in the endoplasmic reticulum at concentrations 1,000 times higher than in the cytosol (the gel-like part of the cell outside organelles). One protein on the endoplasmic reticulum membrane is devoted to allowing Ca2+to move from the endoplasmic reticulum to the cytosol, and another protein moves Ca2+from the cytosol to the endoplasmic reticulum. These processes are not trivialCa2+released into the cytosol allows, for example, for muscle contraction and communication between nerve cells. In this pair of Ca2+transport proteins, you would predict that the protein moving Ca2+from the endoplasmic reticulum to the cytosol ________, and the protein that moves Ca2+from cytosol to the endoplasmic reticulum ________.
A) transports calcium slowly; transports calcium rapidly
B) works without ATP; requires ATP
C) requires ATP; works without ATP
D) is large; is small
E) is small; is large
Answer
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