Show:
lac operon
trp operon
Prokaryotic vs Eukaryotic
Gene Regulation
Miscellaneous
100
The lac repressor blocks transcription when lactose is ____

What is absent?

100

No tryptophan present = trp operon is ____

What is on?

100

These organisms commonly use operons

What are prokaryotes?

100

These DNA sequences reduce transcription initiation

What are silencers?

100

This term refers to genes that code for the primary structure of an enzyme or protein

What are structural genes?

200

Maximum lac operon transcription happens when these two conditions are met

What are lactose present and glucose absent?

200

The trp operon is an example of this type of system

What is repressible?

200

Gene regulation is more complex in these cells

What are eukaryotic cells?

200

These proteins increase transcription initiation

What are activators?

200

This type of control requires a regulator molecule to stimulate transcription

What is positive control?

300

This gene codes for β-galactosidase

What is lacZ?

300

This protein binds to the operator when activated by tryptophan

What is the trp repressor?

300
This RNA processing step is common in eukaryotes but not in prokaryotes

What is splicing?

300

DNA methylation usually has this effect on gene expression

What is decreased?

300

A single mRNA that codes for multiple proteins is called this

What is polycistronic mRNA?

400

When glucose is absent, this molecule rises and helps CAP bind

What is cAMP?

400

In prokaryotes, attenuation is possible because these two processes happen simultaneously

What are transcription and translation?

400

These proteins package DNA in eukaryotes

What are histones?

400

In eukaryotes, these are non-coding segments of DNA or RNA that regulate the expression of genes or operations on the same molecule 

What are cis-acting sequences?

400

This term describes enzymes made continuously regardless of the environment

What are constitutive enzymes?

500
Mutation in lacl causing no functional repressor results in this type of expression

What is constitutive expression?

500

During attenuation, transcription is stopped after the formation of this structure

What is the terminator hairpin (3-4 loop)?
500

These cells can respond rapidly to environmental change through gene regulation

What are prokaryotic cells?

500

Adding acetyl groups to histones usually does this to transcription

What increases transcription?

500

This operon is regulated by a protein that can both activate and repress transcription

What is the ara operon?