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Which pair of molecules are primarily broken down by the cell to release energy during metabolism?
A
Water and carbon dioxide
B
Glucose and fatty acids
C
Amino acids and nucleotides
D
Cholesterol and vitamins
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1
Identify the primary molecules that cells use for energy. In cellular metabolism, the main sources of energy are carbohydrates and lipids.
Understand that glucose is a simple sugar and a primary carbohydrate used by cells for energy through glycolysis and the citric acid cycle.
Recognize that fatty acids are components of lipids and are broken down through beta-oxidation to produce acetyl-CoA, which enters the citric acid cycle.
Consider the role of amino acids and nucleotides. While they can be used for energy, their primary roles are in protein synthesis and genetic information storage, respectively.
Evaluate the role of cholesterol and vitamins. Cholesterol is important for cell membrane structure and hormone synthesis, while vitamins are co-factors in metabolic reactions, not primary energy sources.