Gene Expression and Regulation

What does a promoter do?

• binds RNA polymerase for transcription

• binds DNA polymerase for replication

• binds the operator

• binds the repressor

The lac operon genes only become expressed if:

• lactose binds to repressor

• glucose binds to repressor

• repressor binds to operator

• lactose binds to operator

What does the lactose do to the Operon?

• Blocks transcription of the lactase gene by cutting up the DNA

• Binds to the repressor preventing it from attaching to the operator

• The lactose binds promoter to prevent transcription

• Allows for the transcription rate of lactase to slow down

In the lac operon the inducer is

• lactose

• glucose

• galactose

• all of the above

What structure of this molecule binds with the mRNA molecule?

• Amino Acid

• tRNA

• Anticodon

• Codon

What process is steps 1-3 referring to?

• DNA Replication

• Transcription

• Translation

• Nucleus

Tags

NGSS.HS-LS1-1

What does tRNA carry to the ribosome?

• Nucleus

• Codons

• Amino Acids

• None of the Above

Where does TRANSCRIPTION occur?

• Nucleus

• Ribosome

• Cytoplasm

• Mitochondria

In eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.

• transcription factors

• topoisomerase

• regulatory genes

• activators

Tags

NGSS.HS-LS1-1

Which of the following statements regarding mRNA is correct?

• Exons are included in the protein sequence, while introns are left out

• Introns are included in the protein sequence, while exons are left out

• Exons and Introns can both be included or left out depending on the protein

• Exons and Introns are both part of the mRNA sequence, but only exons are part of the rRNA and tRNA