Question

which macromolecule provides a person with the highest amount of energy per mass?
○ lipids
○ carbohydrates
○ nucleic acids
○ proteins

Explanation:

To determine which macromolecule provides the highest energy per mass, we analyze each option:

• Lipids: Lipids (fats) provide about 9 calories per gram, which is more than carbohydrates and proteins (both provide about 4 calories per gram).
• Carbohydrates: Primarily used for quick energy but have a lower energy density than lipids.
• Nucleic acids: Their main role is in genetic information storage/expression, not energy provision.
• Proteins: Used for structure, enzymes, etc., and provide energy only when other sources are insufficient, with lower energy density than lipids.

So lipids have the highest energy per mass.

Answer:

A. lipids