
Mecanisme moleculare
Quiz
•
Biology
•
9th Grade
•
Practice Problem
•
Easy
Gabriela Cîrstean
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14 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
inactivarea histaminei produse de mastocite in conditii specifice se realizeaza prin
refacerea histaminei in mastocite, dupa exercitarea actiunii acesteia
inactivarea histaminei de catre o serie de enzime eliberate de eozinofilele atrase la locul de secretie al acesteia
inactivarea histaminei de catre o serie de enzime sintetizate de mastocite in mediul extracelular
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
in funcție de valoarea descrescatoare a razei lor de actiune asupra celulelor receptoare difetitele tipuri de molecule informationale pot fi grupate in urmatoarea ordine
hormoni, neurotrasmitatori, prostaglandine
hormoni, mediatori chimici locali, neutrotransmitatori
factori de crestere, hormoni neutrotransmitatori
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
receptorii membranari (de suprafata) ai celulelor receptoare, sensibile la actiunea semnalelor hidrosolubile, au urmatoarea caracteristica principala
intervin nemijlocit in reglarea activitatii unor gene specigice in urma activarii
interactioneaza cu o serie de receptorii intracelulari, moduland activitatea acestora si, in final, expresia genelor specifice
nu regleaza in mod direct expresia genelor specifice, spre deosebire de receptorii cu localizare intracelulara
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
numarun de situsuri de sinteza a ARNm (transcriptie), caracteristice raspunsului secundar, la larvele de Dtosophila melanogaster injectate cu ecdison, este aproximativ
6
250
100
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
persistenta si actiunea de durata aunor mediatori chimici locali in spatiul extracelular (fibronectina, proteoglicani) se datoreaza
ansamblarii acestora sub forma de retele insolubile, de mari dimensiuni, la acest nivel
atasarii la acomponentele fibrelare ale matericei extracelulare
structurii tertiare particulare a cestor molecule
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
receptorii care mediaza actiunea acetilcolinei asupra celulelor-tinta sunt identici in urmatoarele tipuri de celule
fibrele musculare scheletice si celulele secretoare
fibrele musculare scheletice si febrele musculare cardiace
fibrele musculare cardiace si celulele secretoare
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
in general, neutrotrasmitatorii eliberati la nivelul fantei sinaptice poseda urmatoarele caracteristici
o concentratie scazuta si receptori cu afinitate crescuta pentru agentii specifici
o concentrati crescuta si receptori cu afinitate crescuta pentru agenti specifici
o concentrati crescuta si receptori cu afinitate redusa pentru agonistii specifici
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