Transcription and mRNA Structure Quiz

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What is the purpose of the 5' cap added to mRNA during posttranscriptional modifications?

Stabilizes the mRNA molecule in the cytoplasm

Protects mRNA from enzymatic degradation (correct)

Initiates transcription

Facilitates translation

What is the role of the poly(A) tail in mRNA processing?

Promoting splicing of exons

Initiating translation

Stabilizing the RNA molecule in the cytoplasm (correct)

Excising introns

Which signal marks the beginning of the coding region in eukaryotes?

AUG triplet (correct)

Poly(A) tail

5' cap

RNA splicing

What occurs during RNA splicing in eukaryotes?

Ligation of coding exons Signup and view all the answers

What is the term used to describe an mRNA molecule that may encode several different polypeptide chains in prokaryotes?

Polycistronic mRNA Signup and view all the answers

Which enzyme is responsible for the release of the transcribed RNA molecule from the DNA template?

RNA polymerase Signup and view all the answers

Which strand of DNA is responsible for producing the antisense strand in the next generation?

Sense strand Signup and view all the answers

What is the main function of the sense strand during transcription?

Produce the antisense strand Signup and view all the answers

In bacteria, how does RNA polymerase bind to DNA to start synthesis?

Directly to DNA Signup and view all the answers

What is the function of transcription factors (TF) during gene expression?

Control transcription of genetic information Signup and view all the answers

What is the role of the promoter in transcription initiation?

Provide a signal for starting transcription Signup and view all the answers

Which stage of transcription involves RNA polymerase binding to the DNA template at the promoter region?

Template binding Signup and view all the answers

What is the main function of enhancers in transcription regulation?

Increase gene expression Signup and view all the answers

Which step is NOT involved in the formation of the transcription initiation complex?

RNA polymerase binding directly to the promoter Signup and view all the answers

During RNA Chain Elongation, in which direction does chain elongation proceed?

5' to 3' Signup and view all the answers

What is the main role of DNA binding proteins in transcription regulation?

Bring activators closer to the promoter Signup and view all the answers

Which enzyme is responsible for RNA synthesis during transcription?

RNA polymerase Signup and view all the answers

What triggers the termination of RNA synthesis during transcription?

Specific nucleotide sequence acting as a termination signal Signup and view all the answers