Video: Vim li cas A thiab T thiab G thiab C ua khub hauv DNA ob lub helix?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov no txhais tau tias txhua tus ntawm ob strandsin ob npaug - tso tseg DNA ua raws li tus qauv rau tsim ob txoj hlua tshiab. Replication relies oncomplementary puag ua khub , uas yog cov ntsiab lus piav qhia los ntawmChargaff cov cai: adenine (A) ib txwm khi nrog thymine ( T ) thiab cytosine ( C ) ib txwm khi nrog guanine ( G ).
Ib yam li ntawd, T khub nrog dab tsi hauv DNA?
Cov cai ntawm lub hauv paus ua khub (ornucleotide). ua khub ) yog: A nrog T : lub purine adenine(A) ib txwm khub nrog pyrimidine thymine ( T ) Cwith G: thepyrimidine cytosine (C) ib txwm khub nrog purine guanine (G)
Tom qab ntawd, lo lus nug yog, vim li cas DNA strands khiav ntawm qhov sib txawv? DNA strands khiav parallel rau ib leeg tab sis lawv muaj rov qab kev sib tw. Ib leeg DNA strand hastwoends. DNA ob helix yog nyob rau hauv oppositedirections vim o rov qab orientation ntawm cov piam thaj molecule inthem. Qhov kev npaj antiparallel no tso cai rau basepairs ntxiv rau lwm tus.
Ua kom pom qhov no, nws txhais li cas rau ob lub helix ntawm DNA kom muaj kev sib luag thiab sib ntxiv?
Tus qauv ntawm DNA yog npe a doublehelix , uas zoo li ib tug twisted staircase. Vim lub basepairing, lub DNA strands yog complementary toeachother, khiav nyob rau hauv opposite lus qhia, thiab yog hu ua antiparallel strands.
Vim li cas purines yuav tsum ua ke nrog pyrimidine?
Teb thiab piav qhia: Purines ua ke nrog pyrimidines ua vim tias lawv ob leeg muaj nitrogenousbases uas txhais tau hais tias ob qho tib si molecules muaj complementarystructures uas ua
Pom zoo:
Vim li cas peb ntsuas qee qhov kev ncua deb hauv astronomy hauv lub teeb xyoo thiab qee qhov hauv astronomical units?
Feem ntau cov khoom nyob rau hauv qhov chaw nyob deb li deb, hais tias siv ib tug kuj me me chav nyob deb, xws li ib tug astronomical unit, yog tsis siv. Hloov chaw, astronomers ntsuas qhov deb ntawm cov khoom uas nyob sab nraum peb lub hnub ci hauv lub teeb xyoo. Qhov ceev ntawm lub teeb yog kwv yees li 186,000 mais lossis 300,000 kilometers ib ob
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
Yuav ua li cas yog vim li cas vim li cas lub epigenome hloov?
Kev ua neej nyob thiab ib puag ncig (xws li kev haus luam yeeb, noj zaub mov thiab kab mob sib kis) tuaj yeem ua rau tus neeg muaj kev ntxhov siab uas ua rau muaj tshuaj lom neeg. Cov lus teb no, dhau los, feem ntau ua rau muaj kev hloov pauv hauv epigenome, qee qhov tuaj yeem ua rau puas tsuaj
Vim li cas adenine ua khub nrog thymine thiab tsis cytosine?
Raws li pom nyob rau hauv daim duab, ob hydrogen bonds yog tsim ntawm Adenine thiab Thymine, peb hydrogen bonds yog tsim ntawm cytosine thiab guanine. Qhov no yog vim Adenine (purine puag) ua khub tsuas yog nrog Thymine (pyrimidine puag) thiab tsis nrog Cytosine (purine puag)
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q