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ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL


ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar Baboushka » 15 Sep 2013, 14:51

SALUT, :glasses-nerdy:

J'ai un problème avec ce QCM:

QCM 7 : À propos de la microscopie électronique, donnez la (les) réponse(s) vraie(s) :
A) Généralement, pour observer nos préparations, on fixe nos échantillons
B) Sa résolution, très inférieure à 0,2 nm, est meilleure que la microscopie optique
C) Lors de la cryomicroscopie, on vaporise des métaux lourds sur nos échantillons avant de les congeler dans l’azote liquide
D) Dans la microscopie électronique a balayage, ce sont les électrons secondaires qui sont renvoyés à l’utilisateur et qui permettent la visualisation de l’échantillon
E) ABCD sont faux


correction ACD

je ne suis pas d'accord avec la correction de l'item C car je pensais que dans la cryomicroscopie:
- on congèle notre échantillon
- on fracture la mb
- on vaporise du platine ou du carbone
donc la vaporisation se ferait après la congélation

qqn pour m'éclairer ? :starving:

MERCI :victory:
Dernière édition par Baboushka le 16 Sep 2013, 05:18, édité 1 fois.
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar Captain Shepard » 15 Sep 2013, 15:02

Je suis d'accord avec toi ! Ca me parait plus logique de congeler avant de vaporiser les métaux lourds! Donc +1 :glasses-nerdy:
Un héros, il attire les convoitises, il apporte l'espoir. Même s'il faut tutoyer la mort, même s'il faut affronter les crises. Laisse s'enflammer ta détermination. Bats toi pour ceux qui croient en toi, voilà ce qu'est un héros.
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar BOB » 15 Sep 2013, 15:08

D'accord aussi :terror:
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Re: Jaroll, Orknarok and Cronos

Messagepar ASAT » 15 Sep 2013, 15:18

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Moi je suis d'accord avec lui.. de ce point de vue il a raison :wilt: C'est pourquoi c'est la bonne réponse..

Non, en vrai d'acc c'est marqué dans le cours je pense que c'est un errata :lol:
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar BOB » 15 Sep 2013, 15:55

Très belle explication je pense qu'il viens de nous ridiculiser, je m'incline :worship:
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar chloe » 15 Sep 2013, 18:32

effectivement on vaporise après :) j'ai failli lire le long texte ^^
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar BOB » 15 Sep 2013, 18:52

Lol, ça marche merci :time-out:
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar Baboushka » 15 Sep 2013, 19:43

d'acc MERCI :desire: , est ce que les erratas seront édités avant les sorties papier please ? :cute:
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar chloe » 15 Sep 2013, 21:40

je sais pas quand ça sort les papiers mais jsuis pas sur qu'on puisse, je demanderais au chef tut' :)
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Re: ANNATUT QCM 7 P6- item C -MÉTHODE D'ÉTUDE DE LA CELL

Messagepar Baboushka » 16 Sep 2013, 05:17

les papiers sortent Mardi 24, on verra bien, MERCI pour toutes les réponses! :victory:
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