grila 988-aminoacizi

grila 988-aminoacizi
Gandacel asked 8 years ago

988. Ce volum de sol de NaOH 0.1M este necesar pentru neutralizarea a 2 moli de asparaginil-alanina?
A. 20 l de sol de NaOH 0.1 M
B. 3 l de sol  -II-
C. 2 m^3      -II-
D. 2 dm^3   -II-
E. 0,02 m^3 -II-
Raspuns corect: A,E
Stim ca AA N-terminal este cel asparagic, deci o grupa -COOH a sa ramane libera , iar cealalta formeaza legatura amidica cu AA C-terminal, alanina, care are la randul ei gruparea -COOH libera. Din raspunsul problemei reiese ca reactia de neutralizare are loc intr-un singur loc. Din cate stiam pana acum reactia de neutralizare are loc intre o baza si un acid.(de aceea din punctul meu de vedere ar trebui sa mearga la cele 2 grupari -COOH libere)  Daca grila este corecta atunci as vrea sa stiu unde are loc neutralizarea si de ce?
Multumesc!
 

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4 Answers
Ionela answered 8 years ago

Asparaginil vine de la monoamida acidului aspartic adica o sa ai o o gr -COOH , una -NH2 si o grupa amida primara -CONH2… astfel o sa reactioneze unica grupa carboxil de la asparagina  pentru a forma legatura peptidica si dipeptida va avea o singura grupa carboxil care poate reactiona cu NaOH (cea de la alanina )…

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Tudor admin Staff answered 8 years ago

Dupa cuma  aspus si Ionela Asparaginil-ul provine de la Asparagina monoamida acidului aspartic care are o singura functiune de acid carboxilic care va participa la formarea legaturii amidice cu gruparea amino a alaninei astfel asparaginil-alanina are o functiune amidica,o grupare amino(provenita de la asparigina) o legatura peptidica,si o singura grupare -COOH provenita de la alanina.
Astfel reactia dipeptideni cu NaOH va avea loc in raport 1:1.

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Gandacel answered 8 years ago

Am inteles bine, dipeptida arata asa, NH2-CO-CH2-CH2-CO-NH-CH(-CH3)-COOH ? Este cumva o regula de denumire a amidelor provenite din AA? Sau cum le-as putea recunoaste ?

Admin Rares replied 8 years ago

Cand numesti o peptida tai din denumriea tuturor aminoacizilor cu exceptia celui C-terminal terminatia ina sau an si adaugi il in loc,alanil-alanina,leucil-histamina,histamil-glicina bla bla.Daca aveai acid aspartic era aspatil-alanina .U ai insa asparagil alanina.Asparagil provina de la asparagina(ai taiat -ina si adaugat -il)
Acum o sa ma intrebi care e faza cu asparagina?Amionacizii dicarboxilici standart ,acidul aspartic respectiv glutamic prezinta monoamide,monamidele lor inca prezinta o grupare -COOH si o grupare -NH2 legata de o catena hidrocarbonata deci sunt Aminoacizi,si se numest Asparagina si Glutamica.Manualele nu pomenesc de ei,desi au o multime de aplicatii practice si se respecta definitia amionacizilor.
In toate cartile de biochimie din UMF Cluj sunt sunt considerati amionacizi (lucru perfect corect din punct de vedere logic si chimic) in cartea de grile si in diverse subiecte de admitere si de simulate(eu la simulare mi-am luat teapa la o grila de chimie fiindca nu am considerat glutamina amionacid)

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Gandacel answered 8 years ago

Multumesc pentru explicatii!

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