Chromosomes are coiled structures made of DNA and proteins, and during prophase the chromosomes coil up. Given these facts, structures coil when, and are made of DNA and proteins among the following options:
- during the night
 - they bend
 - during prophase
 - during reproduction
 - an organism's body
 - solid, liquid, gas
 - during protein absorbtion
 - Veins and arteries.


 

   during prophase      