RNA Processing - 17.3 Flashcards
1
Q
5’ addition
A
First! CAP guanosine triphosphate, then a methyl group
Triphosphate linkage/bridge
2
Q
3’ addition
A
POLY A TAIL -
COmplex of specific proteins recognizes a polyadenylation signal at 3’ end
Adds long chain of AAAAAAAAA
3
Q
Functions of 3’ tail, 5’ cap
A
- Facilitate export of the mature mRNA from the nucleus
- Help protect the mRNA from degradation by hydolyic enzmes
- Help ribosomes attach to the 5’ end of the mRNA
4
Q
RNA splicing
A
Removal of large portions of the RNA molecule
5
Q
Introns
A
INtervene and are IN the way! Let’s cut them out!
6
Q
Exons
A
EXpressed! Let’s keep them!
7
Q
Who splices out the introns?
A
The SPLICEosome, of course!
8
Q
Ribozymes
A
RNA molecules that function as enzymes
