A string of nucleotides that give the cell information about a certain trait is called a gene.

Here's a breakdown:

* Nucleotides: The building blocks of DNA and RNA. They consist of a sugar, a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, or thymine/uracil).

* String: A sequence of these nucleotides arranged in a specific order.

* Trait: A characteristic or feature of an organism.

Genes contain the instructions for building and maintaining an organism. They tell the cell what proteins to make, and these proteins are responsible for a wide range of functions, from determining eye color to influencing disease susceptibility.