Question

question 1-8
which two macromolecules are used as the primary source of energy for cellular functions?

proteins and lipids
lipids and carbohydrates
nucleic acids and proteins
carbohydrates and nucleic acids

Explanation:

To determine the primary energy - providing macromolecules for cellular functions, we analyze each option:

• Proteins are mainly for structural and functional roles (like enzymes, antibodies) and are not the primary energy source.
• Nucleic acids (DNA, RNA) are for storing and transmitting genetic information, not energy production.
• Lipids can store energy and be used as an energy source, and carbohydrates (e.g., glucose) are the main immediate energy source for cells. So lipids and carbohydrates are the primary energy - providing macromolecules.

Answer:

B. lipids and carbohydrates (assuming the option "lipids and carbohydrates" is labeled as B; adjust the label according to the actual question's option numbering)