Multiple Choice
Which two classes of biomolecules are primarily used by cells for energy storage and supply?
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4. Biomolecules
Introduction to Biomolecules
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Which macronutrient has an energy yield of 9 kcal per gram?
A
Nucleic acids
B
Proteins
C
Carbohydrates
D
Lipids (fats)
Verified step by step guidance1
Step 1: Understand the concept of macronutrients. Macronutrients are nutrients required in large amounts by the body for energy and include carbohydrates, proteins, and lipids (fats). Nucleic acids are not considered macronutrients.
Step 2: Recall the energy yield of each macronutrient. Carbohydrates and proteins both provide 4 kcal per gram, while lipids (fats) provide 9 kcal per gram. This is a key distinction in their energy content.
Step 3: Eliminate options that do not match the energy yield of 9 kcal per gram. Nucleic acids are not macronutrients, and both proteins and carbohydrates yield 4 kcal per gram, so they can be excluded.
Step 4: Confirm that lipids (fats) are the correct answer. Lipids are the only macronutrient with an energy yield of 9 kcal per gram, making them the correct choice.
Step 5: Review the importance of lipids in biological systems. Lipids serve as a dense energy source, provide insulation, and are essential for cell membrane structure and hormone production.
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