Video: Vim li cas koj thiaj tuaj yeem pom lub microscopic DNA yam tsis muaj lub tshuab tsom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv qab a microscope , paub ob-helix molecule ntawm DNA tuaj yeem pom . Vim nws nyias nyias, DNA ua tsis tau pom los ntawm qhov muag liab qab tshwj tsis yog nws cov strands raug tso tawm los ntawm cov nuclei ntawm cov hlwb thiab tso cai rau clump ua ke.
Yog li ntawd, koj puas tuaj yeem pom DNA yam tsis muaj lub tshuab tsom?
DNA yog cov lus qhia tshuaj zoo heev thiab tshwj xeeb uas ua rau txhua yam muaj sia nyob, los ntawm tib neeg mus rau strawberries. Ntau tus neeg xav tias vim li cas DNA me me, peb ua tau 't saib nws tsis muaj muaj zog microscopes . Tab sis qhov tseeb, DNA tau pom tau yooj yim nrog qhov muag liab qab thaum sau los ntawm ntau txhiab lub hlwb.
Tsis tas li ntawd, vim li cas koj thiaj pom DNA koj rho tawm? Cov kws tshawb fawb kawm DNA rau ntau yam: Lawv ua tau xyuas seb cov lus qhia khaws cia hauv li cas DNA pab koj lub cev ua haujlwm zoo. Thaum lub sij hawm a DNA rho tawm , ib tug detergent yuav ua rau lub cell pop qhib, los yog lyse, thiaj li hais tias tus DNA tso rau hauv kev daws teeb meem.
Khaws qhov no hauv kev xav, koj puas tuaj yeem pom ib qho molecule ntawm DNA?
Raws li DNA nws tus kheej tsis muaj cov khoom fluorescent uas ua tau raug exploited rau ib leeg - molecule nrhiav pom, nws yuav tsum tau "stained" kom pom. Feem ntau, fluorescent ligands uas intercalate ntawm lub hauv paus khub los yog khi rau hauv helical grooves yog siv.
Dab tsi yog siv los saib DNA hauv chav kuaj?
Muaj ntau tus kws tshawb fawb siv hluav taws xob, ntsuas qhov tunneling thiab atomic force microscopes rau saib tus kheej DNA molecules,”said Michael W. Davidson, curator ntawm National High Magnetic Field Laboratory ntawm Florida State University.
Pom zoo:
Nyob rau theem twg DNA nyuaj tshaj plaws kom pom nyob rau hauv lub tshuab tsom iav?
DNA yog qhov nyuaj tshaj plaws kom pom ntawm prophase theem ntawm mitosis. Kev piav qhia: Nyob rau theem prophase, tsis muaj cov chromosomes txhais tau zoo. DNA yog tam sim no nyob rau hauv daim ntawv ntawm nyias chromatin fibers uas nyuaj rau pom nyob rau hauv lub microscope
Koj puas tuaj yeem pom meteor da dej yam tsis muaj telescope?
Yog hais tias nws yog lub sij hawm rau ib tug meteor da dej, koj yuav tsis xav tau ib tug telescopes, binoculars, los yog lub roob siab kom muaj ib tug 'lub hnub qub gazing' tog. Tej zaum koj yuav xav tau ib lub hnab pw tsaug zog sov thiab lub tswb moos kom tsa koj nyob nruab nrab hmo ntuj
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
Dab tsi Cells Koj tuaj yeem pom siv lub tshuab ntsuas hluav taws xob?
Lub cell phab ntsa, nucleus, vacuoles, mitochondria, endoplasmic reticulum, Golgi apparatus, thiab ribosomes yooj yim pom nyob rau hauv no kis tau tus mob electron micrograph. (Courtesy ntawm Brian Gunning.)
Cov qauv twg feem ntau yuav pom tau nrog lub tshuab ntsuas hluav taws xob tab sis tsis yog lub teeb tsom iav?
Hauv qab ntawm cov qauv tsim yog pom nyob rau hauv tib lub cell, nyob rau sab laug saib nrog lub teeb microscope, thiab nyob rau sab xis nrog cov kis tau tus mob electron microscope. Mitochondria pom tau nrog lub teeb pom kev zoo tab sis tsis tuaj yeem pom meej. Ribosomes tsuas yog pom nrog lub tshuab ntsuas hluav taws xob