AP Biology Review Topic 6.6 Gene Expression, Cell Specialization

Front

A protein that binds to the operator and blocks the RNA polymerase

Back

repressor protein

Front

What is the name of the stretch of DNA on an operon where RNA polymerase binds to initiate transcription?

Back

promoter

Front

A distal control region that activators bind to are bent to contact mediator proteins and form the transcription initiation complex.

Back

enhancers

Front

In eukaryotes, proteins that help the RNA polymerase bind to the promoter for transcription

Back

transcription factors

Front

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though they look and perform completely different?

Back

The proteins expressed in each cell are different.

Front

What does the inducer molecule do in an inducible operon?

Back

It binds to the repressor protein allowing transcription to occur.

Front

A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.

Back

methylation

Front

During DNA methylation, what happens?

Back

chromatin becomes more tightly packed

Front

Operons are only found in:

Back

prokaryotes

Front

Altering patterns of gene expression in prokaryotes would most likely serve the organism's survival in which way?

Back

allowing the organism to adjust to changes in environmental conditions