compozitia chimica a materiei vii Flashcards

1
Q

din ce este alcatuita materia vie?

A

C,H,N,O,P- oxigenul detine cea mai mare proportie ,C-H constituie rezervele de energie folosita in procesele de oxido-reducere

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2
Q

care sunt componentele chimice ale celulelor?

A

apa si subtantele minerale (substante anorganice) si substantele organice

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3
Q

apa (H2O)

A

are rol de solvent si de a transporta diverse substante in corp

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4
Q

substante minerale?

A

ioni sau saruri, schimba proprietatile fizice ale protoplasmei si au rol in polarizarea membranei celulare

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5
Q

substante anorganice?

A

glucide,lipide,proteine si acizi nucleici

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6
Q

glucidele

A

au rol structural si energetic ,exista simple si complexe

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7
Q

lipidele(grasimi)

A

sursa importanta de energie se gasesc sub forma de emulsii ,cateodata se gasesc in cantitati mari in celulele adipoase sau in anumite seminte
cele mai importante lipide sunt trigliceridele si fosoflipidele

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8
Q

proteinele

A

se coaguleaza la temperaturi de peste 50 de grade preszinta elementul de constructie a materiei vii participa la alcatuirea membranelor celulare alaturi de lipide
rol energetic,functional si transporta anumite substante
proteinele snt formate din aminoacizi

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9
Q

acizii nucleici

A

prezenti in nucleu,au rol de sinteza a moleculelor si transmiterea caracterelor ereditare.

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