Question

katie wants to make ball-and-stick models of the four macromolecules. she has colored balls for each of the elements in these molecules, including the following. red: hydrogen black: carbon purple: oxygen green: nitrogen in which macromolecule will she use the black, red, and purple balls in a ratio of 1:2:1? ∘ carbohydrates ∘ lipids ∘ nucleic acids ∘ proteins

Explanation:

1. Identify elements: Black = Carbon (C), Red = Hydrogen (H), Purple = Oxygen (O). Ratio is 1:2:1 (C:H:O).
2. Recall macromolecule formulas: Carbohydrates (e.g., glucose) have formula \( C_6H_{12}O_6 \), simplifying to C:H:O = 1:2:1. Lipids have variable ratios, proteins/nucleic acids include N (green) not here.

Answer:

carbohydrates