Page 13 - Botany

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5. jvB‡MR ‡QvU †QvU L‡Ûi g‡a¨ eÜbx m„wó I †givgZ mvab K‡i|
6. MvB‡iR DNA AYyi Abywjcb †k‡l mycvi K‡qj ˆZwi K‡i|
7. SSBP DNA binding protein AYywjcbKv‡j DNA m~Î `yBwU‡K c„_K iv‡L|

16| Transcription ej‡Z Kx †evS? cÖwµqvwU Av‡jvPbv Ki|
Transcription t Transcription GKai‡bi enzymatic process ‡hLv‡b RNA polymerase enzyme Gi
Dcw¯’wZ‡Z DNA double helix Gi GKwU strand (template stand) n‡Z RNA ˆZwi nq| GB RNA B ‡cÖvwUb ˆZwii
mKj information enb K‡i|
Transcription cÖwµqv t Transcription cÖwµqvi Rb¨ Pvi ai‡bi DcKiY cÖ‡qvRb-
 DNA template

 RNA polymerase
 Pvi ai‡bi wbDwK¬IUvBW (ATP, GTP, UTP CTP )
++
 Mg
Transcription cÖwµqvwU cÖavYZ PviwU av‡c m¤úbœ nq| h_v-
1. Binding of RNA polymerase to template t  (wmMgv) d¨v±i hy³ RNA polymerase enzyme
me©cÖ_g DNA Gi †cÖv‡gvUv‡ii -35 region G e‡m Ges cieZx©‡Z GbRvBgwU DNA Gi nvB‡Wªv‡Rb eÛ¸‡jv
fvO‡Z _v‡K| d‡j DNA single stand G cwiYZ nq|

2. Chain initiation t ATP A_ev GTP Øviv RNA Chain initiation (ïiæ) nq| Avi¤¢Kvix wbDwK¬IUv‡Wi 3©
OH MÖyc Ges 5©- -triphosphate Gi g‡a¨ cÖ_g phosphodiester bond MwVZ nq|
3. Elongation of the RNA chain t RNA Chain initiation Gi ci RNA polymerase enzyme
(holoenzyme) ‡_‡K  sub unit AcmvwiZ n‡q ‡h core enzyme MwVZ nq Zvi mvnv‡h¨ GKwUi ci GKwU

wbDwK¬IUvBW hy³ n‡q RNA Chain ewa©Z n‡Z _v‡K| Gfv‡e GKwU wbw`©ó base length G DcbxZ n‡j
template n‡Z gy³ n‡Z _v‡K Ges mv‡_ mv‡_ DNA ¯^vfvweK double helix Ae¯’vq wd‡i Av‡m|

4. Chain termination t RNA m~ÎKwU `xN© n‡Z n‡Z hLb Stop codon G †cuŠQvq ZLb ms‡kølY eÜ n‡q hvq| avibv
Kiv nq †h Chain termination Gi Rb¨ `ywU KviY `vqx
1. Activity of rho factor 2. Formation of hair-pin loop
Uvwg©‡bk‡b, RNA cwjgv‡iR Ges GKwU m¤ú~Y© RNA ‡PBb Df‡q DNA †_‡K wegy³ nq| UªvÝwµc‡UW RNA A_©vr

mRNA wbDwK¬qvi iÜ« c‡_ †ewi‡q G‡m ivB‡ev‡mv‡gi †QvU DcGK‡Ki mv‡_ hy&³ nq|
mbRq P›`ª gÛj, mnKvwi Aa¨vcK, Dw™¢` weÁvb wefvM, RqcyinvU miKvwi K‡jR, RqcyinvU| sanjoymondal1980@gmail.com Mob- 01713747235 13