Video: Yuav ua li cas plaub nitrogen bases ua ke?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Pair ua ke tshwm sim thaum nitrogenous bases ua hydrogen bonds nrog ib leeg. Txhua puag muaj ib tus khub tshwj xeeb: guanine nrog cytosine, adenine nrog thymine (hauv DNA) lossis adenine nrog uracil (hauv RNA). Cov hydrogen bonds tsis muaj zog, tso cai rau DNA kom 'unzip'.
Xav txog qhov no, yuav ua li cas nitrogen bases ib txwm ua khub?
Cov nitrogenous bases tsim hydrogen bonds ntawm opposing DNA strands rau tsim cov rungs ntawm "twisted ladder" los yog ob chav helix ntawm DNA los yog ib tug lom catalyst uas muaj nyob rau hauv cov nucleotides. Adenine yog ib txwm ua ke nrog thymine, thiab guanine yog ib txwm ua ke nrog cytosine. Cov no yog lub npe hu ua puag khub.
Tsis tas li ntawd, plaub lub hauv paus nitrogen hauv DNA yog dab tsi thiab lawv qhov tseem ceeb yog dab tsi? A nitrogenous puag tsuas yog ib nitrogen -muaj cov molecule uas muaj cov tshuaj lom neeg zoo ib yam li a puag . Lawv tshwj xeeb tseem ceeb txij li thaum lawv ua lub tsev blocks ntawm DNA thiab RNA: adenine, guanine, cytosine, thymine thiab uracil.
Tsis tas li ntawd, dab tsi yog qhov tseem ceeb ntawm qhov sib lawv liag ntawm lub hauv paus khub?
Lawv sawv cev rau adenine, thymine, cytosine, thiab guanine. Plaub qhov sib txawv bases khub ua ke nyob rau hauv ib txoj kev hu ua complementary ua khub . Adenine ib txwm khub nrog thymine, thiab cytosine ib txwm khub nrog guanine. Cov ua khub Qhov xwm ntawm DNA muaj txiaj ntsig zoo vim nws tso cai rau kev rov ua dua tshiab yooj yim dua.
Vim li cas AC thiab GT tsis tuaj yeem ua khub?
Cov kev npaj ntawm atoms nyob rau hauv plaub yam ntawm nitrogenous bases yog xws li hais tias ob hydrogen bonds yog tsim tau txais thaum A thiab T nyob rau opposite DNA strands, thiab peb yog tsim thaum G thiab C los ua ke li no. A-C los yog G-T sib yuav tsis tau daim ntawv zoo sib xws ntawm cov hydrogen bonds.
Pom zoo:
Ib daim duab plaub puas muaj plaub lub kaum sab xis?
Ib daim duab plaub muaj ob khub ntawm qhov sib npaug ntawm qhov sib npaug, thiab plaub lub kaum sab xis. Nws kuj yog ib qho parallelogram, vim nws muaj ob khub ntawm qhov sib luag. Ib lub xwmfab muaj ob khub ntawm qhov sib npaug, plaub lub kaum sab xis, thiab tag nrho plaub sab sib npaug. Tsis yog, vim lub rhombus tsis tas yuav tsum muaj 4 lub kaum sab xis
Puas yog cov plaub hau daj lossis cov plaub hau xim av muaj ntau dua?
Cov plaub hau xim av yog qhov tseem ceeb tshaj cov plaub hau daj. Cov me nyuam uas muaj ib tug xim av-haired allele thiab ib tug blonde-haired allele yuav nthuav cov plaub hau xim av thiab. Tsuas yog cov uas muaj ob lub ntsej muag plaub hau daj yuav muaj cov plaub hau daj
Muaj pes tsawg guanine bases puas yog 50 lub hauv paus khub ob txoj hlua DNA 100 bases tag nrho muaj yog tias nws muaj 25 adenine bases?
Yog li, muaj tag nrho ntawm 25 + 25 = 50 adenine thiab thymine hauv tag nrho. Qhov ntawd tawm 100− 50 = 50 seem hauv paus. Nco ntsoov tias cytosine thiab guanine daim ntawv cog lus nrog ib leeg, thiab yog li lawv sib npaug ntawm cov nyiaj. Tam sim no peb tuaj yeem faib los ntawm 2 kom tau txais tus lej ntawm guanine lossis cytosine hauv paus
Qhov twg ntawm cov plaub hau plaub hau yog ib txwm plaub hau plaub hau?
square Tsis tas li ntawd nug, qhov ntsuas ntawm ib lub quadrilateral tsis tu ncua yog dab tsi? Yog, sab hauv lub kaum sab xis ntawm txhua lub ces kaum ntawm ib lub quadrilateral tsis tu ncua yog txhua 90 degrees (360 degrees / 4 fab).
Yuav ua li cas muaj pes tsawg tus ntug polyhedron uas muaj plaub lub ntsej muag thiab plaub vertices?
Yog hais tias cov khoom yog polyhedron, npe nws thiab nrhiav tus naj npawb ntawm lub ntsej muag, ntug thiab vertices nws muaj. Lub hauv paus yog daim duab peb sab thiab txhua sab yog daim duab peb sab, yog li qhov no yog daim duab peb sab pyramid, uas tseem hu ua tetrahedron. Muaj 4 lub ntsej muag, 6 ntug thiab 4 ntsug