Here's why:
* DNA contains the genetic code: DNA holds the instructions for building and maintaining an organism. These instructions are encoded in the sequence of nucleotides within the DNA molecule.
* Genes control protein synthesis: Specific segments of DNA, called genes, contain the instructions for building specific proteins.
* Proteins are the building blocks: Proteins are essential for virtually all biological processes, including:
* Structural components: Proteins provide the framework for cells, tissues, and organs.
* Enzymes: Proteins catalyze (speed up) biochemical reactions necessary for growth and development.
* Hormones: Proteins act as messengers, regulating growth and other processes.
* Cell division and growth: DNA replication allows for the transmission of genetic information to daughter cells during cell division, driving growth and development.
While other macromolecules like proteins play a crucial role in growth processes, DNA provides the blueprint and instructions for the entire process.
