What is the source of energy used to power the sodium-potassium pump?

• A. Glucose
• B. ATP
• C. NADH
• D. GTP

Answer: (B)

Verified step by step guidance

1. Understand the function of the sodium-potassium pump: It is a type of active transport mechanism that moves sodium (Na+) ions out of the cell and potassium (K+) ions into the cell against their concentration gradients.
2. Recognize that active transport requires energy because it moves ions against their concentration gradients, which is not a spontaneous process.
3. Identify the source of energy for active transport: The most common energy source for cellular processes, including the sodium-potassium pump, is adenosine triphosphate (ATP).
4. Recall that ATP provides energy by releasing a phosphate group, which converts it to adenosine diphosphate (ADP) and releases energy that can be used by the pump.
5. Conclude that the sodium-potassium pump is powered by ATP, as it provides the necessary energy to change the conformation of the pump and transport ions across the cell membrane.