Multiple Choice
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
Multiple Choice
In the context of cellular energy generation, which molecule is commonly referred to as the primary energy currency of the cell?
A
ATP (adenosine triphosphate)
B
Glucose
C
DNA (deoxyribonucleic acid)
D
NADH (nicotinamide adenine dinucleotide, reduced form)
Verified step by step guidance1
Understand that the question asks for the molecule commonly known as the primary energy currency of the cell, 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 through the breaking of its high-energy phosphate bonds.
Consider the other options: Glucose is a source of energy but not the direct energy currency; DNA stores genetic information; NADH is an electron carrier involved in energy production but not the main energy currency itself.
Recognize that ATP's structure, with three phosphate groups, allows it to release energy efficiently when the terminal phosphate bond is broken, making it the universal energy currency.
Conclude that ATP is the correct answer because it directly provides energy for cellular activities such as muscle contraction, active transport, and biosynthesis.
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