Gene Regulation

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on

• It accounts for the regulation of gene activity in response to the needs of the cells

• To make DNA for the gene

• To make the gene turn of and off

what does a promoter do?

• it allows a gene to be transcribed

• it creates a DNA segment

• it is another word for ribosomes

• it is another word for RNA

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

What is the name given to part of a DNA molecule that codes for a protein?

• Glucose

• Chromosome

• Gene

• Phosphate

Tags

NGSS.HS-LS1-1

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

In the lac operon model the genes within the operon will be expressed (switched on) if:

• lactose is absent in the cell

• glucose is present in the cell

• lactose is present in the cell

• glucose is absent in the cell

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

• True

• False

Which can be found in all animals and determine the general blueprint for the body plan of animals?

• Homeobox genes

• Language genes

• Type I Genes

• Type II Genes

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

• inducer

• repressor

• activator

• corepressor

One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.

• transcriptional

• translational

• post-transcriptional

• post-translational