AP Biology Gene Expression and Regulation

Where does the repressor in an operon bind?

• Operator

• Promoter

• Regulatory sequence

• TATA box

If the repressor is bound to the operator…

• RNA polymerase is able to bind, the operon is off

• RNA polymerase is able to bind, the operon is on

• RNA polymerase is unable to bind, the operon is off

• RNA polymerase is unable to bind, the operon is on

The initial steps in gene expression are modeled. Double-stranded DNA first unwinds into two strands. Which process and product are represented in the diagrams?

• Process: transcription; product: mRNA

• Process: translation; product: protein

• Process: replication; product: tRNA

• Process: recombination; product: polymerase

Tags

NGSS.HS-LS1-1

The lac operon is…

• Inducible operon so starts off and is activated by lactose

• Inducible operon so starts on and is deactivated by lactose

• Repressible operon so starts off and is activated by lactose

• Repressible operon so starts on and is deactivated by lactose

Tags

NGSS.HS-LS3-1

The trp operon is a(n)…

• Inducible operon – activated by trp

• Inducible operon – deactivated by trp

• Repressible operon – activated by trp

• Repressible operon – deactivated by trp

What types of cells have operons? 

• Eukaryotes

• Prokaryotes

• Neither eukaryotes nor prokaryotes

• Both eukaryotes and prokaryotes

What makes up the TATA box?

• Adenine & Cytosine

• Cytosine & Guanine

• Guanine & Thymine

• Thymine & Adenine

Where is the TATA box located?

• Near the introns

• Near the exons

• Near the poly adenylation sequence

• Near the promoter

Describe the effect of adding methyl group to DNA.

• Decreases condensation which decreases transcription

• Decreases condensation which increases transcription

• Increases condensation which decreases transcription

• Increases condensation which increases transcription

Describe affect of acetylating the histone tails

• Decreases condensation which decreases transcription

• Decreases condensation which increases transcription

• Increases condensation which decreases transcription

• Increases condensation which increases transcription