Prokaryotic Gene Regulation Flashcards
What is the prokaryotic genome made up of?
- One double-stranded circular chromosome
- Plasmids
Prokaryotes do not contain histone proteins, with the exception of?
Archaea
Ribosomes in prokaryotes can immediately translate mRNA following transcription - how?
Because there is no nucleus that separates the DNA from the ribosomes
What are the two ways in which bacteria can regulate metabolic pathways?
- Through controlling enzyme activity (feedback inhibition)
- By regulating gene expression
Between adjusting enzyme activity and regulating gene expression, which method of controlling metabolic pathways is more of a long-term response?
Regulating gene expression
Genes clustered together within a single promoter in a prokaryotic cell form a what?
An operon
What are the two types of operons?
- Repressible operon
- Inducible operon
Which type of operon is normally switched off with no transcription, but can be induced?
Inducible operon
Which type of operon is normally switched on and transcriptionally active, but can inhibited?
Repressible operon
Is the repressible operon anabolic or catabolic?
Anabolic
Is the inducible operon anabolic or catabolic?
Catabolic
Is the trp operon an inducible or repressible operon?
Repressible
is the lac operon an inducible or repressible operon?
Inducible
What type of gene regulation enhances transcription in low glucose levels?
Positive gene regulation
The lac operon is always switched off in the absence of?
Lactose
