Question

gene expression is determined by several factors, including (1 point)
senescence
protein synthesis
chemicals in the body
the brain

Explanation:

Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product. Chemicals in the body, such as signaling molecules, transcription factors, and hormones, can regulate gene expression. Senescence is the process of aging at the cellular level and is not a direct factor in gene expression determination. Protein synthesis is the end - result of gene expression (when a gene is expressed, it often leads to protein synthesis), not a determining factor. The brain is an organ and not a direct factor in gene expression regulation compared to the more direct role of chemicals in the body.

Answer:

chemicals in the body