Proteins needed for a specific function, such as using lactose as an energy source, are often encoded together in a single block in prokaryotic DNA. What is this block called?
AAn enhancer
BA UTR marker
CA nucleosome
DAn operon
Answer & Solution
Correct answer: D. An operon
1. Genes involved in the same biochemical pathway are often encoded together in blocks called operons.
2. The genes needed to use lactose as an energy source, for example, are coded together in the lac operon.
3. An enhancer is instead a eukaryotic DNA sequence that boosts transcription, not a block of prokaryotic genes.
4. A UTR and a nucleosome are unrelated structures, not blocks of co-transcribed genes.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 16 "Gene Expression", section 16.2 Prokaryotic Gene Regulation_
Related questions
Regulatory proteins that bind to the untranslated regions of an RNA molecule can change hoSome new cancer drugs are designed around individual patients' gene expression patterns raThe protein c-Flip exists in two forms, a long form and a short form, and is involved in tIn cancer cells, silenced genes commonly show a specific combination of epigenetic changesThe gene myc encodes a transcription factor that becomes an oncogene when aberrantly activOne tumor suppressor gene is described as the most studied of its kind and is mutated in oCyclin B is a protein that normally serves as a cell-cycle checkpoint protein. In cancer cA protein tagged with an ubiquitin group is marked for a specific fate inside the cell. Wh