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Video: Dab tsi yog qhov ua haujlwm ntawm lub cell membrane?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov tseem ceeb kev ua haujlwm ntawm plasma membrane yog los tiv thaiv cell los ntawm nws ib puag ncig. Ua los ntawm ib tug phospholipid bilayer nrog embedded proteins, lub plasma daim nyias nyias yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm hlwb.
Hais txog qhov no, 4 lub luag haujlwm tseem ceeb ntawm lub cell membrane yog dab tsi?
Tshuaj lom neeg daim nyias nyias muaj peb lub luag haujlwm tseem ceeb : (1) lawv khaws cov tshuaj lom neeg tawm ntawm lub cell ; (2) lawv muaj cov receptors thiab cov channel uas tso cai rau cov molecules tshwj xeeb, xws li ions, as-ham, pov tseg, thiab cov khoom lag luam metabolic, uas cuam tshuam cov cellular thiab extracellular kev ua ub no kom dhau ntawm organelles thiab nruab nrab ntawm cov khoom.
Kuj Paub, tus qauv ntawm lub cell membrane thiab nws txoj haujlwm yog dab tsi? Cov cell membrane yog multifaceted daim nyias nyias lub hnab ntawv a cell cov cytoplasm. Nws tiv thaiv kev ncaj ncees ntawm cov cell nrog rau kev txhawb nqa cell thiab pab tswj lub cell cov puab. Proteins thiab lipids yog cov khoom tseem ceeb ntawm cov tshuaj cell membrane.
Ib sab ntawm no, dab tsi yog tsib lub luag haujlwm ntawm lub cell membrane?
Cov ntsiab lus hauv cov teeb no (5)
- tiv thaiv lub cell los ntawm kev ua raws li kev thaiv.
- tswj kev thauj khoom hauv thiab tawm ntawm tes.
- tau txais chemical messengers los ntawm lwm lub cell.
- ua raws li receptor.
- cell mob, secretions, thiab absorptions ntawm cov khoom.
Dab tsi ua rau lub cell membrane?
Phospholipids ua lub hauv paus qauv ntawm a cell membrane . Qhov kev npaj ntawm phospholipid molecules ua cov lipid bilayer. Phospholipids ntawm a cell membrane yog teem rau hauv ob txheej hu ua lipid bilayer. Lub taub hau hydrophilic phosphate yeej ib txwm npaj kom lawv nyob ze dej.
Pom zoo:
Lub luag haujlwm ntawm CDK yog dab tsi hauv lub cev ua haujlwm ntawm tes tshwj xeeb hauv lub voj voog ntawm tes?
Los ntawm phosphorylation, Cdks teeb liab lub xov tooj ntawm tes uas nws tau npaj kom dhau mus rau theem tom ntej ntawm lub voj voog ntawm tes. Raws li lawv lub npe qhia, Cyclin-Dependent Protein Kinases yog nyob ntawm cyclins, lwm chav kawm ntawm kev tswj hwm cov protein. Cyclins khi rau Cdks, ua kom cov Cdks rau phosphorylate lwm cov molecules
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Lub luag haujlwm ntawm lub cell membrane yog dab tsi thaum lub sijhawm thauj mus los?
Lub cell membrane yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm lub hlwb. Lub luag haujlwm tseem ceeb ntawm cov cell membrane yog los tiv thaiv lub cell ntawm nws ib puag ncig. Nws muaj phospholipid bilayer nrog embedded proteins
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua