Chapter 14 Flashcards
1
Q
What does a gene include
A
DNA sequences that code for all exons and introns; entire transcription unit (promoter, RNA coding sequence, and terminator)
2
Q
Exons
A
Coding sequences found within mature RNA molecule
3
Q
Introns
A
Non coding regions which are removed from pre-mRNA by splicing
(common in eukaryotes)
4
Q
What is added to the 5’ end of mRNA?
A
Methylated Guanine cap to facilitate binding to ribosome
5
Q
What is added to 3’ end of mRNA ?
A
PolyA tail is added to facilitate binding and to stabilize molecule
6
Q
What is mRNA splicing?
A
Removal of introns
7
Q
What is mRNA splicing accomplished by?
A
Spliceosome
8
Q
What is the spliceosome made up of?
A
snRNA molecules (5) and 300 proteins
9
Q
Guide RNA Function?
A
Adds nucleotides to RNA that were not originally coded by DNA
