Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Chromosomes are coiled structures made of DNA and proteins. Chromosomes are the form of the genetic material of a cell during cell division. During other phases of the cell cycle, DNA is not coiled into chromosomes. Instead, it exists as a grainy material called chromatin . Answer: chromosomes
A:
What is the term for coiled structures made of dna and proteins?