Here's why:
* DNA contains the genetic code: DNA is a long molecule that contains the instructions for building and maintaining an organism. This information is encoded in the sequence of its four building blocks (adenine, guanine, cytosine, and thymine).
* Genes within DNA: The DNA is organized into genes, which are specific segments of DNA that contain instructions for building a particular protein or functional RNA.
* Proteins carry out cellular functions: Proteins are the workhorses of the cell. They perform a wide variety of functions, including:
* Enzymes: Catalyze chemical reactions.
* Structural components: Provide shape and support.
* Transport molecules: Move substances across cell membranes.
* Signaling molecules: Relay information within and between cells.
In summary: The DNA within a cell contains the instructions for building proteins. These proteins then carry out all the functions necessary for the cell to survive, grow, and reproduce.
