AA Flashcards

1
Q

alanina naturala roteste planul luminii polarizate spre stanga sau spre dreapta? ce este?
totusi, din ce serie face parte?

A

este dextrogira ( roteste spre dreapta )
apartine seriei L

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2
Q

la ce temperaturi se topesc AA ( prin descompunere )

A

mari, de peste 250 de grade

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3
Q

ce atractii se stabilesc intre amfionii aminoacizilor si apa?

A

atractii electrostatice

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4
Q

ce gust au multi dintre AA?

A

dulce

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5
Q

ce forte se intalnesc intermolecular?

A
  • legaturi de h
  • forte electrostatice
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6
Q

ce coloratie dau aminoacizii in solutie ACIDA (NU BAZICA!!). de FeCl3?

A

albastra

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7
Q

ce noua legatura se form prin reactia de alchilare a AA?

A

C-N

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8
Q

ce rezulta din dezaminarea unui AA?

A

un hidroxiacid, azot si apa
NU AMONIAC

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9
Q

in ce stare de agregare se afla AA in stare amfionica?

A

solida si in solutii apoase

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10
Q

unde fixeaza grupa amino protonul si prin ce fel de legatura ?

A

il fixeaza pe DUBLETUL DE ELECTRONI NEPARTICIPANTI de la azot
printr-o legatura covalenta-coordinativa

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11
Q

ce ioni exista in solutia apoasa a unui AA?
care forma se gaseste in mare exces?
in ce cantitati se gasesc moleculele neionizate?

A

cation, amfion, anion
forma amfionica
extrem de mici

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12
Q

in ce solutie migreaza aminoacidul spre catod ? ACIDA. SAU BAZICA?

A

ACIDA

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13
Q

in ce solutie migreaza aminoacidul spre ANOD ? BAZICA SAU ACIDA?

A

BAZICA

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14
Q

care este punctul izoelectric al glicocolului ?

A

6,1

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15
Q

care este punctul izoelectric al lisinei?

A

9,7

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16
Q

care este punctul izoelectric al acidului aspartic?

A

3,0

17
Q

solutia apoasa a unui aminoacid este o solutie tampon. ce inseamna asta?

A

ins. ca prin contactul cu o cant. mica dintr-o baza/dintr-un acid, AA ul nu isi schimba semnificativ pH-ul

18
Q

sub ce forma se afla aminoacidul in solutii bazice?

A

anion

19
Q

sub ce forma se afla aminoacidul in solutii acide?

A

cation

20
Q

ce rol important are tirosina?

A

transportul si stocarea iodului in organism