lecture 18

What is the function of the promoter region in a typical E. coli transcription unit?

• To terminate transcription

• To bind RNA polymerase and initiate transcription

• To translate RNA into protein

• To degrade RNA

Which region in the E. coli transcription unit is responsible for recognizing the gene?

• +1 Region

• Terminator Region

• -35 Region

• Polypeptide Region

What is the start codon in the RNA sequence of a typical E. coli transcription unit?

• UAA

• AUG

• PPP

• COOH

What is the role of the rho (ρ) helicase in rho-dependent transcriptional termination?

• It binds to a rut site and migrates along the mRNA.

• It forms an RNA hairpin at a palindromic sequence.

• It directly releases the mRNA from the DNA template.

• It synthesizes RNA from a DNA template.

In rho-independent termination, what structure is formed to reduce the length of the RNA-DNA hybrid?

• An RNA hairpin

• A DNA loop

• A protein complex

• A ribosome

Where does transcription occur in prokaryotes?

• Nucleus

• Cytoplasm

• Ribosome

• Mitochondria

In eukaryotes, where does translation occur?

• Nucleus

• Cytoplasm

• Ribosome

• Endoplasmic reticulum

How are transcription and translation related in prokaryotes?

• They are uncoupled

• They are coupled

• They occur in the nucleus

• They occur in the mitochondria

What happens to newly transcribed eukaryotic mRNAs?

• They are immediately translated

• They undergo processing

• They are degraded

• They are exported to the mitochondria

What is the role of the TATA box in eukaryotic promoter recognition?

• It acts as a major key promoter in most eukaryotic promoters.

• It is involved in DNA replication.

• It is a site for protein synthesis.

• It is responsible for RNA splicing.