Multiple Choice
Which term best describes the use of energy and matter by living organisms to maintain life processes?
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7. Energy and Metabolism
Introduction to Energy
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In all cells, the renewable energy source is _________.
A
carbon dioxide
B
adenosine triphosphate (ATP)
C
oxygen
D
glucose
Verified step by step guidance1
Understand the question: The problem is asking about the renewable energy source used in all cells. This refers to the molecule that provides energy for cellular processes.
Recall the key concept: Cells require a molecule that can store and release energy efficiently. This molecule is often referred to as the 'energy currency' of the cell.
Eliminate incorrect options: Carbon dioxide is a waste product of cellular respiration, not an energy source. Oxygen is a reactant in cellular respiration but does not directly store energy. Glucose is a source of energy but must be broken down to release usable energy.
Identify the correct answer: Adenosine triphosphate (ATP) is the molecule that stores and releases energy for cellular processes. It is renewable because it can be regenerated from adenosine diphosphate (ADP) and inorganic phosphate (Pi) during cellular respiration.
Conclude: The renewable energy source in all cells is adenosine triphosphate (ATP). This molecule is critical for powering various cellular activities, such as muscle contraction, active transport, and biosynthesis.
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