Fact 1: Chromosomes are coiled structures made of DNA and proteins.

Fact 2: Chromosomes are made up of DNA and histone proteins.

Given the two facts above, answer the question "What are part of chromosomes?" with the following options: 
- Chemical energy
 - color of leaves
 - sensory neurons
 - the body's largest organ
 - Most plants
 - histone proteins
 - keeps the organism warm
 - more abundant


 

      histone proteins   