nukleinske kiseline_2010
TRANSCRIPT
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NUKLEINSKE KISELINE
Šećeri koji ulaze u sastav nukleinskih kiselina:
H H
OH
HOOH
H H
HOCH2 O
H
H H
OH
OH
H H
HOCH2 O
-D-ribofuranoza
-D-2-deoksiribofuranoza
riboza 2-deoksiriboza
RNK DNK
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Heterociklične baze koje ulaze u sastav nukleinskih kiselina:
Pirimidinske baze:
pirimidin
uracil timin citozin
RNK RNK i DNKDNK
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purin
Purinske baze:
adenin guanin
RNK i DNK RNK i DNK
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Nukleozidi:• Nastaju zamenom hidroksilne grupe na C1 šećera jednim azotom neke baze
1'
2'3'
4'
5'
H
H H
OH
H H
HOCH2 O N
N
O
NH2
1
2
34
5
6
2’ DEZOKSICITIDIN
DNK
N
N
O
NH2
H H
HOOH
H H
HOCH2 O
RNK
CITIDIN
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1'
2'3'
4'
5'
H
H H
OH
H H
HOCH2 O
O
H
1
2
34
5
6N
N
O
H3C
2’ -DEZOKSITIMIDIN
O
H
1
2
34
5
6N
N
O
H H
HOOH
H H
HOCH2 O
URIDIN
RNKDNK
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1'
2'3'
4'
5'
H
H H
OH
H H
HOCH2 O
NH2
N
N
N
N
1'
2'3'
4'
5'
H
H H
OH
H H
HOCH2 O
N
N
N
N
O
H
NH2
2’ DEZOKSIADENIDIN
2’ DEZOKSIGUANIDIN
DNK RNK
NH2
N
N
N
N
H H
HOOH
H H
HOCH2 O
H H
HOOH
H H
HOCH2 O
N
N
N
N
O
H
NH2
ADENIDIN
GUANIDIN
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Nukleotidi:• Nastaju uvođenjem fosfatne grupe (građenjem estra) na C5' šećera u nukleozidu
Nukleotidi DNA:
N
N
O
NH2
1'
2'3'
4'
5'
H
H H
OH
H H
OCH2 OHO
OH
P
O
1'
2'3'
4'
5'
H
H H
OH
H H
OCH2 OHO
OH
P
OH3C
O
H
1
2
34
5
6N
N
O
2’ DEZOKSICITIDILNA KISELINA2’ DEZOKSITIMIDILNA KISELINA
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Nukleotidi DNA:
1'
2'3'
4'
5'
H
H H
OH
H H
OCH2 OHO
OH
P
O
NH2N
N
N
N
2’ DEZOKSIADENILNA KISELINA
N
N
N
N
O
H
NH21'
2'3'
4'
5'
H
H H
OH
H H
OCH2 OHO
OH
P
O
2’ DEZOKSIGUANIDILNA KISELINA
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Nukleotidi RNA:
CITIDILNA KISELINA
H
HO
OH
P
O
H
HOOH
H H
OCH2 O N
N
O
NH2
URIDILNA KISELINA
O
H
1
2
34
5
6N
N
O
H
HO
OH
P
O
H
HOOH
H H
OCH2 O
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ADENILNA KISELINA
NH2N
N
N
N
H
HO
OH
P
O
H
HOOH
H H
OCH2 O
GUANIDILNA KISELINA
H
HO
OH
P
O
H
HOOH
H H
OCH2 O
N
N
N
N
O
H
NH2
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AMPADP
ATP
cAMP
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NUKLEINSKE KISELINE su polinukleotidi
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ADENIN TIMIN
CITOZINGUANIN
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Prema najjednostavnijoj definiciji gen Prema najjednostavnijoj definiciji gen predstavlja segment DNK molekula koji predstavlja segment DNK molekula koji sadrži šifru za sekvencu aminokiselina u sadrži šifru za sekvencu aminokiselina u polipeptidnom lancu, kao i regulatorne polipeptidnom lancu, kao i regulatorne sekvence koje su potrebne za sekvence koje su potrebne za ekspresiju. ekspresiju.
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