AP BIOLOGY

Detailed explanation-1: -Mostly gene regulation occurs when information in a gene’s DNA is passed to mRNA which is called transcription.

Detailed explanation-2: -Gene regulation can occur at any point during gene expression, but most commonly occurs at the level of transcription (when the information in a gene’s DNA is passed to mRNA). Signals from the environment or from other cells activate proteins called transcription factors.

Detailed explanation-3: -Given this statistic, it is not surprising that the primary control point for gene expression is usually at the very beginning of the protein production process-the initiation of transcription. RNA transcription makes an efficient control point because many proteins can be made from a single mRNA molecule.

Detailed explanation-4: -Initiation of transcription is the most important step in gene expression. Without the initiation of transcription, and the subsequent transcription of the gene into mRNA by RNA polymerase, the phenotype controlled by the gene will not be seen.