Gene Regulation/Development (15-16)

What is a gene?

• A segment of RNA that encodes for a protein
• A chromosome
• A segment of DNA that encodes for a protein
• Your genome

Tags

NGSS.HS-LS1-1

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

• promoter
• repressor
• operator
• gene

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

An operon consists of all the the following EXCEPT

• operator
• promoter
• regulatory gene
• genes of the operon

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

• regulator
• repressor
• activator
• corepressor

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 an example of positive control?

• The lac operon being transcribed when lactose is present
• The trp operon being transcribed when tryptophan is absent
• the lac promoter being activated by CAP when cAMP levels rise
• control is all just an illusion

The tryptophan operon is a repressible operon that is

• permanently turned on.
• turned on only when tryptophan is present in the growth medium.
• turned off only when glucose is present in the growth medium.
• turned off whenever tryptophan is added to the growth medium.

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

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

• regulator
• repressor
• activator
• corepressor