BOTANY
CYTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3 sodium move out of the cell and 2 potassium move into the cell each cycle
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ATP is used to change the shape of the transporter protein
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it is used to move sodium and potassium down their concentration gradients
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initially the transporter protein is open toward the inside of the cell
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Detailed explanation-1: -Answer and Explanation: The sodium potassium pump is a form of active transport, as it moves solutes against their concentration gradients, and hydrolyzes ATP to do so.
Detailed explanation-2: -Potassium (K+) is found in higher concentrations inside the neuron at rest. It moves freely across the neuronal membrane, so there is a tendency for (K+) to move out of the neuron down the concentration gradient.
Detailed explanation-3: -This statement is false. The sodium-potassium pump hydrolyzes ATP to move sodium (Na+) and potassium (K+) ions into or out of a cell. Each cycle of the pump indeed moves 3 Na+ and 2 K+. However, Na+ are moved out of the cell, not into it.
Detailed explanation-4: -The sodium-potassium pump system moves sodium and potassium ions against large concentration gradients. It moves two potassium ions into the cell where potassium levels are high, and pumps three sodium ions out of the cell and into the extracellular fluid.