DNA Flashcards
what soes rRNA do?
combines with proteins to form ribosomes
what does tRNA do?
carries amino acids to be incorporated into protein
what does mRNA do?
carries genetic information for protein synthesis
where is TATA box present?
around -25 nucleotides before the transcription start
what is TFIID?
a general transcription factor
required for all Pol II transcribed genes
what happens in RNA transcription termination?
newly synthesised RNA makes stem loop structure
followed by a stretch of Us
RNA released. polymerase dissociates
how are the ends of mRNAs processed?
addition of polyAtail to 3’ end
addition of 5’ cap- marks mRNA
what does EF alpha do?
brings next aminoacyl-tRNA to A site
what EF-2do?
moves ribosome along the mRNA
what catalyses the peptide bond formation between amino acids in P and A?
peptide transferase
which factor is released in termination? what does it do?
RF, binds to the codon and the ribosome dissociates
where does termination occur?
how?
when at A site and the ribosome encounters a stop codon
