Gene Regulation

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell
• glucose is present in the cell
• lactose is present in the cell

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

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

Tags

NGSS.HS-LS1-1

All of the following are true about histone acetylation EXCEPT

• takes place on the histone
• enzymes add a acetyl group
• when it occurs, transcription is more likely to occur
• chromatin becomes more tightly packed

In eukaryotes, a cluster of proteins (RNA polymerase II, mediator proteins, etc.) that assemble on the promoter is called the

• transcription initiation complex

• control element

• activator

• protein blobby thing

A distal control region that activators bind to. The region is then bent by the DNA-bending protein to join mediator proteins and form the transcription initiation complex.

• enhancers

• promoters

• repressors

• transcription factors

All the genes in both a prokaryotic cell and a eukaryotic cell are expressed at the same time.

• True

• False

In eukaryotes, DNA is tightly coiled around ____ in chromatin

• Histones

• Whey

• Casein

• Hemoglobin

The production of mature mRNA in eukaryotes involves

• cutting introns out and spicing exons together
• adding the 5' cap
• adding the 3' poly A tail
• all of these are correct

In an operon, a sequence of DNA where RNA polymerase binds prior to transcription.

• operator

• promoter

• initiator

• repressor

In an operon, the sequence of DNA that serves as a binding site for a repressor, and thereby regulates the expression of structural genes.

• promoter

• inducer

• operator

• repressor