3 - Structure and Properties of RNA Flashcards
1
Q
properties of rna?
A
- single stranded
- 5 to 3
- shorter than DNA
2
Q
what makes mrna stable in its structure?
A
in the stem, comp bases form bonds
3
Q
structure of trna?
A
- the anticodon loop codes for the AA
- aa is carried by trna at the acceptor stem
4
Q
how is pre-mrna synthesised by transcription?
A
- helicase unwinds dna
- rna polyermerase lays down rna primers W/OUT primer
- pre-mrna travels from nucleus to RER into ribosomes
5
Q
what are the 4 types of rna?
A
rrna - makes up ribosomes with proteins
trna - in translation codes for AA to ribosomes
mrna - has amino acid seq
snrna - form complxes needed in rna processing
6
Q
what are the 3 parts of a gene?
A
promoter - specfies beginning of transcription [not trans]
coding seq - part that includes aa sequence
terminator - ends sequence [not transc]
7
Q
how are introns removed?
A
by snRNPS
snRNPS bind to intron
intron loops out [spliceosome]
exons spliced together
[introns survive to be in pre-mrna but not in translation]
