What is the first step in gene expression?

The initial step in gene expression is transcription. During transcription, the DNA sequence of a gene is transcribed to create messenger RNA (mRNA). This process occurs in the nucleus of eukaryotic cells and involves several key steps, including the unwinding of the DNA double helix and the synthesis of RNA strands that are complementary to the DNA template. The mRNA produced during transcription carries the genetic information needed for the subsequent step of translation, where proteins are synthesized based on the mRNA sequence.

Understanding that transcription is the first stage of gene expression is crucial, as it sets the stage for the entire process of protein synthesis, which is essential for cellular function and regulation.