Question

what is the purpose of dna?
to create a triple helix
to control other organelles
store water and food necessary for life
it contains the genetic information for an organism

Explanation:

DNA is the molecule that carries the genetic instructions for the development, functioning, growth and reproduction of all known living organisms and many viruses. It stores the genetic information of an organism. The other options are incorrect as creating a triple - helix is not its main purpose, it doesn't directly control other organelles in that way, and it doesn't store water and food.

Answer:

It contains the genetic information for an organism