WLHS / AP Bio / Monson Name
Date Per
CHAPTER 18 STUDY QUESTIONS, part 1 –
Regulation of Gene Expression: Prokaryotes vs. Eukaryotes (p. 351-366)
1) What are the two levels within which metabolic control can occur in bacteria?
2) What is the advantage of feedback inhibition? In what kinds of pathways is this mechanism typically found?
3) What is the key advantage of grouping genes of related function (e.g. the genes encoding all of the enzymes in
the tryptophan synthesis pathway) into one transcription unit?
4) Label each component / product of the trp operon shown below - (see fig. 18.3a)
(environmental / cellular conditions: tryptophan absent, repressor inactive, operon on).
5) How does a repressor work? What kind of gene encodes a repressor protein?
6) How is the trp repressor protein an allosteric protein?
7) Briefly, what is the key difference between a repressible operon and an inducible operon?
