Final answer:
The structure on chromosomes that holds the information the cell uses to direct its activities and make sure it copies itself correctly is called DNA.
Step-by-step explanation:
The structure on chromosomes that holds the information the cell uses to direct its activities and make sure it copies itself correctly is called DNA (Deoxyribonucleic Acid).
DNA is the blueprint of life and contains the genetic instructions for the development, growth, and functioning of living organisms. It is composed of nucleotides that are arranged in a double helix structure. Each nucleotide consists of a sugar molecule, a phosphate group, and a nitrogenous base (adenine, thymine, cytosine, or guanine).
When a cell divides, the DNA must be replicated so that each new cell receives an identical copy of the genetic information. This process ensures that the cell's activities are properly regulated and that the genetic information is accurately passed on to the next generation.