Question

1/16 macromolecules on quiz
possible points: 2.78
if an organism has depleted its immediate energy source from carbohydrates, which class of macromolecules will it primarily use next for long - term energy storage?
○ monosaccharides
○ lipid
○ protein
○ dna

Explanation:

1. Recall the energy - storage roles of different macromolecules:

• Monosaccharides are simple sugars and are used for immediate energy, not long - term storage. So this option is incorrect.
• Lipids (fats) are a major form of long - term energy storage in organisms. When carbohydrates (the primary short - term energy source) are depleted, lipids are used for long - term energy storage because they can store a large amount of energy per unit mass and are more energy - dense than carbohydrates.
• Proteins are mainly used for structural and functional purposes (such as enzymes, cell structure) and are only used as an energy source in extreme cases of starvation, not as a primary long - term energy storage molecule.
• DNA is the genetic material and is not used for energy storage.

Answer:

B. lipid (assuming the second option is labeled as B, with the option text "lipid")