AP Biology Gene Regulation and Viruses and Bacteria

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

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

NGSS.HS-LS1-4

What does the inducer molecule do in an inducable operon?

• it binds to the repressor protein allowing transcription to occur
• it binds to the promoter allowing transcription to occur
• it binds to the operator and stops transcription
• it binds to the repressor and stops transcription

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

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

What type of operon is the lac (lactose) operon?

• inducible
• repressible
• positive control
• promoible

Transcription begins at sequences called

• Start Codons
• Promoters
• Origins
• Introns

Which of the following is an example of post-transcriptional control of gene expression?

• the addition of methyl groups to cytosine bases of DNA
• the binding of transcription factors to a promoter
• the removal of introns and splicing together of exons
• gene amplification contributing to cancer

The process by which a cell becomes specialized for a specific structure or function.

• cell multiplication
• cell division
• mitosis
• cell differentiation

Tags

NGSS.HS-LS1-4

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

• methylation
• acetylation
• alternative splicing
• snRPs

What are 2  ways gene expression is controlled in prokaryotes?

• Through inducible and repressible operons
• Through introns and exons
• Through methylation and acetylation
• Through enhancers and distal control elements