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Which of the following is a measure of the energy needed to move a sodium ion from a high concentration to a low concentration?
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3. Energy
Energy Sources and Generation
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In most living cells, what molecule is commonly referred to as the cell's primary energy currency?
A
NADH (reduced nicotinamide adenine dinucleotide)
B
DNA (deoxyribonucleic acid)
C
ATP (adenosine triphosphate)
D
Glucose
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Understand that the question asks for the molecule commonly known as the cell's primary energy currency, which means the molecule that stores and provides energy for most cellular processes.
Recall that ATP (adenosine triphosphate) is the molecule that cells use to transfer and store energy in a readily usable form.
Recognize that NADH is an important electron carrier involved in energy production but is not the direct energy currency used by cells.
Note that DNA stores genetic information and glucose is a sugar molecule used as an energy source, but neither is the direct energy currency.
Conclude that ATP is the correct answer because it directly provides energy for cellular activities through the hydrolysis of its high-energy phosphate bonds.
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