RNA Processing - 17.3

Question 1

5’ addition

Answer 1

First! CAP guanosine triphosphate, then a methyl group

Triphosphate linkage/bridge

Question 2

3’ addition

Answer 2

POLY A TAIL -
COmplex of specific proteins recognizes a polyadenylation signal at 3’ end
Adds long chain of AAAAAAAAA

Question 3

Functions of 3’ tail, 5’ cap

Answer 3

1. Facilitate export of the mature mRNA from the nucleus
2. Help protect the mRNA from degradation by hydolyic enzmes
3. Help ribosomes attach to the 5’ end of the mRNA

Question 4

RNA splicing

Answer 4

Removal of large portions of the RNA molecule

Question 5

Introns

Answer 5

INtervene and are IN the way! Let’s cut them out!

Question 6

Exons

Answer 6

EXpressed! Let’s keep them!

Question 7

Who splices out the introns?

Answer 7

The SPLICEosome, of course!

Question 8

Ribozymes

Answer 8

RNA molecules that function as enzymes