peretele cel. si membrana-cel. EK Flashcards

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1
Q

care este principala particularitate a cel. EK?

A

are nucleu

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2
Q

… este regasit doar la plante si la fungi

A

peretele celular

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3
Q

din ce este format peretele celular

A

polizaharide

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4
Q

cum se dezvolta peretele celular

A

mai intai reprezinta doar un strat primar, iar ,dupa aceea, pe interiorul acestuia apare un strat secundar

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5
Q

ce este lamela mijlocie

A

structura care cimenteaza peretii celulari intre ei

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6
Q

2 idei despre rolul peretelui celular

A

-mentine forma celulei
-face legatura dintre cel. si mediul extern fiind permeabil pt. majoritatea. subst. slubile in apa

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7
Q

din ce este alcatuita membrana cel.?

A

fosfolipide si proteine

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8
Q

din ce sunt alcatuite fosfolipidele?

A

structuri formate din 2 acizi grasi si o grupare fosfat

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9
Q

cum sunt dispusi acizii si gruparile fosfat in membrana, de ce?

A

-fosfatul este dispus la exterior, hidrofil,
-acizii grasii sunt dispusi in interior, hidrofobi
-bistrat

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10
Q

cum sunt dispuse proteinele in membrana?

A

-pe fata exterioara
-pe fata interioara
-transmembranar

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11
Q

doua roluri ale membranei

A

-rolul informational
-control asupra schimburilor de subst.(realizat de proteine)

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12
Q

cum se realizaeaza schimburile de subst. dintre celule?

A

prin procese active sau pasive

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13
Q

in ce constau procesele active de schimb de subst.?

A

proteinele transporta subst. de la o sol. mai putin concentrata la una mai putin concentrata

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14
Q

procesele pasive de schimb de subst.

A

sol. concentrata -> sol. mai putin concentrata

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15
Q

care sunt procesele pasive de schimb de subst.?

A

difuzia si osmoza

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16
Q

ce este citoza?

A

schimbul de subst. prin intermediul unor vezicule, inglobari de subst.