The organic compounds in living things are organized into groups: carbohydrates, lipids, proteins, and nucleic acids. Which two compounds do living things most commonly use as an energy source?
proteins and carbohydrates
lipids and nucleic acids
carbohydrates and lipids
proteins and nucleic acids

Question

The organic compounds in living things are organized into groups: carbohydrates, lipids, proteins, and nucleic acids. Which two compounds do living things most commonly use as an energy source?  
       proteins and carbohydrates
       lipids and nucleic acids
       carbohydrates and lipids
       proteins and nucleic acids

anonymous · Answer

Carbohydrates and lipids; proteins are used for growth/repair and nucleic acids for dna replication