Vim li cas membrane sidedness yog lub ntsiab lus tseem ceeb hauv biology? Tshawb nrhiav permeability yog nyob ntawm ob qho tib si semi permeable membrane thiab cov khoom thauj tshwj xeeb… Qhov kev nkag mus ntawm cov molecules thiab ions, daim ntawv cog lus rau cov khoom thauj tshwj xeeb, hla ib daim nyias nyias ntawm lawv cov concentration gradient.
txhais tau li cas los ntawm sab ntawm lub plasma membrane?
Kev taw qhia ntawm cov proteins hauv bilayer yog asymmetric, muab cov membrane "sidedness"; cov protein domains nthuav tawm rau ntawm ib sab ntawm lub bilayer txawv ntawm qhov nthuav tawm ntawm sab nraud, qhia txog kev ua haujlwm asymmetry.
Vim li cas peb thiaj xav tau kev thauj mus los?
Membrane thauj yog tseem ceeb rau lub neej ntawm tesRaws li cov cell mus dhau lawv lub neej voj voog, kev sib pauv loj heev yog qhov tsim nyog los tswj kev ua haujlwm. Kev thauj mus los yuav suav nrog kev koom ua ke ntawm cov roj ntsha molecules thiab tso tawm cov khoom pov tseg uas tsim nyog rau kev ua haujlwm ib txwm muaj.
Vim li cas lub cell membrane ua haujlwm tseem ceeb?
Lub cell membrane, yog li ntawd, muaj ob lub luag haujlwm: thawj, ua qhov cuam tshuam khaws cov khoom ntawm cov cell hauv thiab tsis xav tau cov khoom tawmthiab, thib ob, ua lub rooj vag tso cai thauj mus rau hauv lub cell ntawm cov as-ham tseem ceeb thiab txav los ntawm lub cell ntawm cov khoom pov tseg.
Lub hom phiaj ntawm cov protein ntau yog dab tsi?
Integral membrane proteins yog nyob ruaj khov nyob rau hauv lub plasma membrane. Lawv muaj ntau yam haujlwm tseem ceeb. Cov haujlwm no suav nrog channeling lossis thauj cov molecules hla daim nyias nyias. Lwm cov proteins ib txwm ua raws li cov cell receptors.
