Question

the main classes of biological molecules are
□ carbohydrates
□ lipids
□ starches
energy (atp)
proteins

Explanation:

The main classes of biological molecules (biomolecules) are carbohydrates, lipids, proteins, and nucleic acids (though nucleic acids isn't an option here). Among the given options:

• Carbohydrates: One of the four main biomolecule classes, used for energy, structure, etc.
• Lipids: Another main class, for energy storage, cell membranes, etc.
• Starches: A type of carbohydrate (polysaccharide), not a main class itself.
• Energy (ATP): ATP is an energy - carrying molecule, not a main biomolecule class.
• Proteins: One of the four main biomolecule classes, with roles in structure, enzymes, etc.

So the correct options are the ones for carbohydrates, lipids, and proteins.

Answer:

A. carbohydrates, B. lipids, E. proteins