coursenotes campbell and reese 7th edition test

Spliceosome a large complex made up of proteins and RNA molecules that splices RNA by interacting with the ends of an RNA intron, releasing the intron and joining the two adjacent exons. Exon a sequence within a primary transcript that remains in the RNA after RNA processing also refers to the region of DNA from which this sequence was transcribed. Intron a noncoding, intervening sequence within a primary transcript that is removed from the transcript during RNA processing also refers to the region of DNA from which this sequence was transcribed. RNA splicing the removal of portions (introns) of the transcript that will not be included in the mRNA. Poly-A Tail A sequence of 50 to 250 adenine nucleotides added onto the 3′ end of a pre-mRNA molecule.

5′ Cap a modified form of guanine nucleotide added onto the nucleotide at the 5′ end of a pre-mRNA molecule. RNA Processing modification of RNA transcripts, including splicing out of introns, joining together of exons, and alteration of the 5' and 3' ends. TATA Box A DNA sequence in eukaryotic promoters crucial in forming the transcription initiation complex. Transcription Initiation Complex The completed assembly of transcription factors and RNA polymerase bound to a promoter. Transcription factors a collection of proteins that mediate the binding of RNA polymerase and the initiation of transcription. Transcription Unit the stretch of DNA that is transcribed into an RNA molecule. Terminator in bacteria, a sequence of nucleotides in DNA that marks the end of a gene and signals RNA polymerase to release the newly made RNA molecule and detach from the DNA.

Promoter the DNA sequence where RNA polymerase attaches and initiates transcription.

Coursenotes campbell and reese 7th edition test