Qhov Tseem Ceeb Qhov txawv - Sense vs Antisense Strand
DNA molecules muaj tag nrho cov ntaub ntawv caj ces, uas yog qhov tsim nyog rau kev loj hlob thiab kev saib xyuas ntawm lub cev. DNA yog qhov tseem ceeb ntawm kev yug me nyuam ntawm feem ntau ntawm cov kab mob. DNA yog ib tug complex molecule uas muaj plaub nucleotides, uas yog; adenine (A), guanine (G), cytosine (C), thiab thymine (T). Cov kab ke ntawm cov hauv paus no txiav txim siab cov lus qhia hauv genome. DNA molecule muaj ob txoj hlua. Nrog rau cov pab pawg phosphate thiab deoxyribose qab zib pawg (sib sau ua ke hu ua lub caj qaum ntawm DNA), ob-stranded DNA molecule tsim nws cov duab tshwj xeeb; ib ob helix. Cov duab yog tsim los ntawm coiling ob txoj kab sib luag, ib qho los ntawm 5' mus rau 3' thiab lwm qhov los ntawm 3' mus rau 5'. Ob txoj hlua yog tuav ua ke los ntawm hydrogen bonds. Ob txoj hlua no muaj npe raws li nws ua haujlwm li cas thaum lub sijhawm sau ntawv. Kev hloov pauv yog thawj kauj ruam ntawm kev tsim cov protein, qhov twg cov ntaub ntawv hauv ib ntu DNA tau theej rau hauv mRNA tshiab (tus tub txib-RNA) molecule nrog muaj RNA polymerase enzyme. Thaum lub sijhawm sau ntawv, ib qho DNA strand nquag koom ua tus qauv, uas yog hu ua antisense strand lossis template strand. Lwm qhov kev sib txuas ntxiv yog hu ua kev xav strand lossis coding strand. Qhov sib txawv tseem ceeb yog qhov tsis zoo li antisense strand, qhov kev nkag siab strand tsis siv rau hauv cov txheej txheem sau ntawv. Hauv kab lus no, qhov sib txawv ntawm kev nkag siab thiab antisense strands ntawm DNA tau tham.
Sense Strand yog dab tsi?
Sense strand yog cov hlua ntawm DNA uas tsis yog siv los ua tus qauv hauv cov txheej txheem ntawm kev sau ntawv. Tab sis qhov tshwm sim RNA molecule yog qhov zoo ib yam rau qhov kev nkag siab strand, tshwj tsis yog muaj Uracil (U) es tsis txhob thymine (T). Sense strand muaj codons.
Antisense Strand yog dab tsi?
Antisense strand yog cov qauv siv strand siv nyob rau hauv cov txheej txheem ntawm transcription. Qhov tshwm sim mRNA thiab kev nkag siab strand yog complementary rau no strand. Cov kab no muaj cov tshuaj tiv thaiv codons.
Qhov txawv ntawm Sense thiab Antisense Strand yog dab tsi?
Nyob hauv kev sau ntawv:
Sense Strand: Nucleotides tsis txuas rau kev nkag siab strand
Antisense Strand: Nucleotides txuas rau antisense strand los ntawm hydrogen bonds
Base sequence:
Sense Strand: Lub hauv paus sequences ntawm kev nkag siab strand yog sib npaug rau RNA tshiab transcribed
Antisense Strand: Lub hauv paus sequences ntawm antisense strand yog complementary rau tshiab RNA transcribed.
