composition chimique des cellules vivantes Flashcards

1
Q

de quoi sont formés les proteoglycanes (PG)?

A

glycosaminoglycane (GAG) + protéine

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2
Q

exemples d’heteropolysaccharides

A
  1. polysaccharides qui rentrent dans la composition du peptidoglycane
  2. glygosaminoglycanes (GAG)
  3. hemicellulose
  4. pectine
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3
Q

de quoi est formé le glygosaminoglycane (GAG)?

4infos

A
  • -repetition d’unite disaccharidique qui contient
  • -une hexosamine (sulfatée ou non)
  • -un acide uronique
  • -( dont le radical acide donne une charge electronegative elevee a la molecule)
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4
Q

a quoi peuvent se lier les proteines?

+ composes obtenus

A
  1. proteines + oligosaccharides = glycoproteine
  2. proteines (histones) + acide nucleiques (adn) = chromatine
    3.
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5
Q

quels sont les types d’homopolysaccharides?

2 exemples pour chaque types

A
  1. homopolysaccharide de structure
    a. chitine
    b. cellulose
  2. homopolysaccharide de reserve
    a. glycogene
    b. amidon
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6
Q

de quoi est forme le peptidoglycane

A

hétéropolysaccharides ( N-acetylglucosamine –lisaison glycosidique– N-acetylmuramique)

                                         \+

tétrapeptide

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7
Q

quels sont les glycosaminoglycanes (GAG)? 5

A
  1. acide hyaluronique ( non sulfaté)
  2. chondroitine-sulfate
  3. keratane-sulfate
  4. héparane-sulfate
  5. dermatane-sulfate
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