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Elige el verbo que esté conjugado correctamente en el  preté…

Elige el verbo que esté conjugado correctamente en el  pretérito.    Todavía no (comprar) [1] el libro que me recomendaste.  ¿A qué hora (venir/tú) [2] ayer al trabajo? No me gusta llegar tarde, pero esta semana (llegar / yo) [3] tarde a todas mis clases.  Ayer tú me (pedir) [4] que compre las bebidas y ¡mira!, ¡las compré! ¿Cuántas veces ellos nos (prestar) [5] dinero y nunca nos (decir) [6] que en realidad no podían hacerlo? ¿Recuerdas la comida que Bertina (hacer) [7] para mi cumpleaños? Quiero aprender a cocinarla. (Yo: venir) [8] a verte porque quiero hablar contigo. Nosotros (estar) [9] en Valencia hace unos 5 años. ¿Por dónde (andar) [10] ustedes el mes pasado? Los quisimos visitar pero nunca los encontramos.

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The groove of MHC class II molecules allows the binding of l…

The groove of MHC class II molecules allows the binding of longer peptides than those that bind to the grove of MHC class I molecules.

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Allelic exclusion prevents the expression of B cell receptor…

Allelic exclusion prevents the expression of B cell receptors that recognize self-antigens.

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Not all T cell complete development and maturation. A number…

Not all T cell complete development and maturation. A number of T cells end up dying through a mechanism described as death by neglect and governed by the nature of interaction with MHC molecules. Which one of the following levels of T cells-MHC interactions leads to death by neglect?

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Which of the following cell(s) recognizes glycolipid antigen…

Which of the following cell(s) recognizes glycolipid antigens conjugated to CD1d molecule expressed on antigen presenting cells.

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Notch are IL-7 are respectively the key transcription factor…

Notch are IL-7 are respectively the key transcription factor and cytokine for commitment of T cell lineage.

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The genes of major histocompatibility complex (MHC) encode p…

The genes of major histocompatibility complex (MHC) encode polymorphic and nonpolymorphic genes. Which one of the following are encoded by nonpolymorphic genes?

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Positive selection is the mechanism that allows the host to…

Positive selection is the mechanism that allows the host to retain T cells that recognize self MHC class I or MHC class II.

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What is this tissue? 

What is this tissue? 

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Bonus Question: What does the the ABCDE acronym used to dist…

Bonus Question: What does the the ABCDE acronym used to distinguish melanomas from other skin cancers and from normal moles stand for?

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