In certain cells, a transport protein moves one calcium ion out of the cell against its concentration gradient while allowing the movement of three sodium ions into the cell down sodium's electrochemical gradient. Which of the following CORRECTLY describes this cotransport of calcium and sodium?a. primary active transport by an antiporterb. primary active transport by a symporterc. secendory active transport by a symporter
d. secendory active transport by an antiporter
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In certain cells, a transport protein moves one calcium ion out of the cell against its concentratio...
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