Control of Gene Expression Review Questions

1. What are each of the following?
   a Barr body
   heterochromatin and euchromatin
2. What is an operon? [answer]
3. What is the function of each of the following: promoter, regulator, structural gene, operator.
4. What is the function of the following? transcription factors, promoter, enhancer
5. Describe each of the following types of control seen in eukaryotic cells: transcriptional, posttranscriptional, translational, posttranslational, and feedback control.
6. Describe the process in which an RNA duplex is formed. Answer
7. Describe how tryptophan levels are regulated in prokaryotic cells (the trp operon). Answer