Transcription and RNA Processing KHAN

What is transcription?

• The process of copying out the DNA sequence of a gene to make an RNA molecule

• The process of synthesizing a protein from an RNA molecule

• The process of splicing introns from a pre-mRNA molecule

• The process of adding a 5' cap and poly-A tail to an RNA molecule

Which enzyme is involved in transcription?

• DNA polymerase

• RNA polymerase

• Ligase

• Helicase

What is the direction of RNA synthesis during transcription?

• 3' to 5'

• 5' to 3'

• Both 3' to 5' and 5' to 3'

• Neither 3' to 5' nor 5' to 3'

What are the three stages of transcription?

• Initiation, elongation, and termination

• Replication, translation, and transcription

• Splicing, capping, and tailing

• Promoter binding, exon skipping, and intron removal

What is the purpose of RNA modifications in eukaryotes?

• To increase the stability of the mRNA

• To remove introns and join exons

• To add a 5' cap and poly-A tail

• All of the above

How are eukaryotic pre-mRNAs processed?

• By adding a 5' cap and poly-A tail

• By splicing out introns

• By both adding a 5' cap and poly-A tail and splicing out introns

• By neither adding a 5' cap and poly-A tail nor splicing out introns

What happens during the initiation stage of transcription?

• RNA polymerase binds to the promoter region

• RNA polymerase synthesizes an RNA strand

• RNA polymerase adds a 5' cap and poly-A tail

• RNA polymerase splices out introns

What is the role of terminators in transcription?

• They signal the completion of RNA synthesis

• They bind to RNA polymerase and prevent further transcription

• They add a 5' cap and poly-A tail to the RNA molecule

• They remove introns from the pre-mRNA

How is transcription controlled for each gene in the genome?

• Transcription is always active for all genes

• Transcription is controlled individually for each gene

• Transcription is controlled by RNA polymerase

• Transcription is controlled by DNA polymerase

What is the purpose of splicing in eukaryotic transcription?

• To remove introns and join exons

• To add a 5' cap and poly-A tail

• To increase the stability of the mRNA

• To prevent RNA polymerase from binding to the promoter