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Which term best describes the process by which the body takes in and uses food?
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7. Energy and Metabolism
Introduction to Metabolism
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Which of the following is a major source of energy for your body?
A
Hemoglobin
B
Glucose
C
Cholesterol
D
DNA
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Understand the question: The problem is asking about the major source of energy for the human body. This requires knowledge of macromolecules and their roles in biological processes.
Recall the primary macromolecules: The body uses carbohydrates, lipids, proteins, and nucleic acids for various functions. Among these, carbohydrates are the primary source of energy.
Identify glucose as a carbohydrate: Glucose is a simple sugar (monosaccharide) and a key carbohydrate that serves as the main energy source for cellular respiration.
Eliminate incorrect options: Hemoglobin is a protein involved in oxygen transport, cholesterol is a lipid important for cell membranes and hormones, and DNA is a nucleic acid that stores genetic information. None of these are primary energy sources.
Conclude that glucose is the correct answer: Glucose is metabolized during cellular respiration to produce ATP (adenosine triphosphate), the energy currency of the cell.
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