Question

Sebastian wants to make ball-and-stick models of the four macromolecules. He has colored balls for each of the elements in these molecules, including the following.

red: hydrogen
black: carbon
purple: oxygen
green: nitrogen

Which molecule could he make that consists of long chains of red and black colored balls?
carbohydrates
lipids
nucleic acids
proteins

Answer 1

Lipids.

Fatty acids in lipids are long hydrocarbon chains made mostly of carbon (black) and hydrogen (red), whereas carbs, proteins, and nucleic acids also contain oxygen and/or nitrogen.