Biologists use ball-and-stick models to study complex molecules by representing atoms with balls and bonds with sticks. DNA is a biological molecule that contains millions of atoms. What is a limitation of using a ball-and-stick model to represent a complete DNA molecule?

DNA contains millions of atoms, so a ball-and-stick model of the complete molecule would need millions of balls and many connecting sticks. Building a model on that scale could make it too large and expensive. The other choices describe problems that are not necessary limitations: models can use different colors for atom types, and bonds are represented by the sticks.

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