Question

question 1-2
biological macromolecules are organic compounds. they all contain carbon. the function of a biological macromolecule depends on what other elements it contains. which of these biological macromolecules is rich in nitrogen and functions as a building...
options:
carbohydrate
lipid
nucleic acid
protein

Explanation:

To determine which biological macromolecule is rich in energy and functions as a storage molecule, we analyze each option:

• Carbohydrates: Mainly provide quick energy (e.g., glucose) and structural support (e.g., cellulose), not primary long - term energy storage.
• Lipids: Include fats and oils. They are highly reduced molecules, so they store a large amount of energy. For example, adipose tissue in animals stores fat as an energy reserve.
• Nucleic acids: Their main function is to store and transmit genetic information (DNA and RNA), not energy storage.
• Proteins: Primarily involved in structural support (e.g., collagen), enzymatic activity, transport, etc., and are not used as primary energy storage molecules (only in cases of extreme starvation when other sources are exhausted).

So, lipids are the biological macromolecules that are rich in energy and function as storage molecules.

Answer:

lipid