In positive regulation, most of the genes are usually inactive (that is, RNA polymerases do not bind to the promoters) and the cell synthesizes only the activator proteins needed to promote transcription of the subset of genes required in the cell at that time.
举一反三
- Tumor suppressor genes encode proteins that normally restrain cell division. Mutation in one or more of these genes can lead to tumor formation.
- Yeast mutants that are defective in their ability to complete cell division have led to the discovery of many genes that control the cell-division cycle—the so-called Cdc genes—and have provided a detailed understanding of how these genes, and the proteins they encode, actually work.
- Which T cell subset is NOT expressing a STAT transcription factor?
- proteins are the final products of most genes
- proteins are the final products of most genes A: 正确 B: 错误