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why did the northern colonies of America place such an emphasis on education/literacy?

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La phase oxydative est rompue lorsque NADPH, H+ cellulaire sont importants par rapport aux besoins en Ribose 5P ?

Proposition(s) correcte(s)ABDEProposition(s) fausse(s)C : FAUX, les spermatogonies Ap constituent le pool de renouvellement alors que les spermatogonies Ad constituent le pool de réserve. Concernant les cellules souches, on a une prolifération des cellules germinales primordiales (spermatogonies) par mitose, puis se transforment en gonocytes(cellules embryonnaires sexuelles diploïdes) et deviennent les spermatogonies souches, qui elles-mêmes donnent les spermatogonies A et spermatogonies B. (qui se divisent par mitose). Spermatogonie A :Ad ou AO (dark, chromatine granulaire foncée), souches, renouvellement en Ap et assurent Ia réservent en Ad également. Ap (chromatine fine, dispersée et claire, poussière), se divisent par mitose en donnant les spermatogonies B.

Proposition(s) correcte(s)EL'axonème dérive du centriole distal. Ilse met en place lors de la spermiogénèse et joue un rôle essentiel dans la mobilité du spz. On retrouve 2 MT A centraux formant le doublet central entouré par 9 doublets de MT périphériques forme d'un MT A complet et d'un MT B incomplet.Les doublets périphériques sont reliés entre eux par des bras de dynéines interne et externe qui proviennent du MT A d'un doublet et qui viennent se fixer sur le MT B du doublet adjacent. Les doublets périphériques sont reliés au doublet central via les ponts radiaires (partent du MT A périph vers le MT A central) qui présentent un renflement au centre : La tête radiaire.La mise en œuvre du mouvement du spz nécessite de l'NRJ qui sera fournie par les mitochondries sous forme d'ATP qui sera hydrolysés par l'ATPase fixée aux bras de dynéine .Cette hydrolyse entraîne un accrochage/décrochag

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