Video: Puas muaj cov proteins uas muaj peev xwm xav tau lub zog?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev thauj mus los carrier proteins xav tau lub zog txav cov tshuaj tiv thaiv lawv cov concentration gradient. Qhov ntawd zog yuav tuaj nyob rau hauv daim ntawv ntawm ATP uas yog siv los ntawm lub carrier protein ncaj qha, los yog siv tau zog los ntawm lwm qhov chaw.
Raws li, cov proteins channel puas xav tau lub zog?
Channel Protein Thauj Cov txheej txheem uas molecules dhau los ntawm ib daim nyias nyias ntawm a channel protein hu ua carrier-mediated transport. Muaj ob hom kev thauj uas siv channel proteins . Thawj hom ua tsis yog xav tau lub zog txav cov khoom hla lub cell membrane.
Ib yam li ntawd, vim li cas thauj cov proteins xav tau lub zog? Active kev thauj yog kev txav ntawm cov ntaub ntawv los ntawm lub cell membrane siv cell membrane siv cellular zog . thauj cov protein yuav tsum muaj zog ua haujlwm vim nws xav tau zog ces passive thauj uas xav tau tsis muaj zog tag nrho.
Yog li ntawd, cov cab kuj muaj protein ntau active los yog passive?
Active Kev thauj mus los yog kev txav ntawm cov khoom hla ib daim nyias nyias tawm tsam nws cov concentration gradient. Tsis zoo li channel cov proteins uas tsuas yog thauj khoom los ntawm daim nyias nyias passively , carrier proteins tuaj yeem thauj ions thiab molecules ib yam nkaus passively los ntawm kev yooj yim diffusion, los yog ntawm theem nrab nquag thauj.
Yuav ua li cas molecules mus rau carrier proteins?
Lipophilic molecules, suav nrog me me, tsis muaj cov khoom siv molecules zoo li dej thiab oxygen, diffuse los ntawm daim nyias nyias. yooj yim diffusion down ib tug concentration gradient. Cov kws kho mob tshwj xeeb cov proteins pab txhawb rau nthuav tawm ntawm ntau molecules; lawv yog tshwj xeeb rau cov molecule thauj thiab txav mus rau ib tug concentration gradient.
Pom zoo:
Puas yog lub zog gravitational zoo ib yam li lub zog muaj peev xwm?
Lub zog muaj peev xwm yog lub zog uas khaws cia rau hauv ib yam khoom lossis khoom siv. Gravitational muaj peev xwm zog yog lub zog nyob rau hauv ib yam khoom uas yog tuav nyob rau hauv ib tug ntsug txoj hauj lwm. Elastic muaj peev xwm lub zog yog lub zog khaws cia hauv cov khoom uas tuaj yeem ncab lossis compressed
Dab tsi yog qhov txawv ntawm electrostatic muaj peev xwm thiab electrostatic muaj peev xwm zog?
Tsis muaj qhov sib txawv ntawm electrostatic potentialenergy thiab hluav taws xob (al) muaj peev xwm zog. Lub peev xwm hluav taws xob ntawm ib qho taw tes yog kev ua haujlwm los ntawm lwm qhov kev quab yuam hauv kev txav chav tsev zoo los ntawm ib qho arbitrarilychosen xoom ntawm lub peev xwm (feem ntau infinity) mus rau lub ntsiab lus
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
Puas yog lub zog hauv daim ntawv ntawm kev txav yog lub zog muaj peev xwm?
Lub zog nyob rau hauv daim ntawv ntawm kev txav yog 'muaj peev xwm' zog. Qhov ntau dua 'mas' ib qho khoom txav muaj, lub zog kinetic nws muaj. Lub pob zeb ntawm ntug pob tsuas muaj 'kinetic' zog vim nws txoj hauj lwm. 'Thermal' zog yog lub zog khaws cia los ntawm cov khoom uas ncab los yog compression
Puas muaj peev xwm equilibrium zoo ib yam li so muaj peev xwm?
Qhov sib txawv ntawm daim nyias nyias muaj peev xwm thiab qhov muaj peev xwm sib npaug (-142 mV) sawv cev rau lub zog hluav taws xob hluav taws xob uas tsav Na + mus rau hauv lub xovtooj ntawm lub peev xwm so membrane. Thaum so, txawm li cas los xij, qhov permeability ntawm daim nyias nyias mus rau Na + tsawg heev kom tsuas yog me me Na + xau rau hauv lub cell