Examen
Immunology Exam 4 Review Ch 7 & 8 with 100% correct answers
- Grado
- Institución
Immunology Exam 4 Review Ch 7 & 8 with 100% correct answers
[Mostrar más]Vista previa 2 fuera de 10 páginas
Vista previa 2 fuera de 10 páginas
Añadir al carrito
Añadir al carrito
Vendedor
Seguir
Sakayobako30
Comentarios recibidos
Vista previa del contenido
Immunology Exam 4 Review Ch 7 & 8Development (maturation) of T cells, where does it take place? - correct answer ✔✔Thymus
What gene segments are rearranged for the alpha and beta chains? - correct answer ✔✔Alpha: VJ
Beta: VDJ
Are the RAG genes used in the rearrangement? - correct answer ✔✔Yes
What makes up pre-TCR? - correct answer ✔✔Beta chain and pt-alpha (surrogate alpha chain) + CD3 +
zeta chain
Know what IL-7 and Notch-1 do and when they exert their influence on developing T-cells - correct
answer ✔✔Notch-1 is a simple signaling mechanism in the thymus during the maturation process, signal
sent on all stages of maturation to drive T cells in their differentiation
IL-7 help T cell on what to do on the next step of its maturation
DiGeorge's syndrome. What is the cause? What chromosome is involved? What organ is involved? -
correct answer ✔✔A deletion of chromosome 22 in which the thymus fails to develop and T cells are
absent. This will make a person susceptible to a wide range of opportunistic infections. Resembles SCID;
genetic disease.
"Double negative" thymocytes; Why are they called this and where would you find them in the body? -
correct answer ✔✔Immature T cells in the thymus that do not express CD4 or CD8. Gene rearrangement
has begun. Posses CD2, CD5, CDiA and IL-7 receptor.
Are RAG-1 and 2 working in somatic recombination of T-cells genes also? What about the 12/23 rule (1/2
turn rule)? - correct answer ✔✔yes and yes
The 12/23 rule applies.
, Which takes place first positive or negative selection? Where does positive selection take place and
where does negative selection take place? - correct answer ✔✔Positive selection takes place first and
occurs in the cortex of the thymus. This process ensures that T cells 1st recognize YOUR MHC molecules.
Negative selection occurs next in the medulla of the thymus. This process will initiate apoptosis upon T
cells whose antigen receptors BIND TOO STRONGLY to the complexes of self peptides and self MHC
molecules presented by thymic cells.
Lifespan of a T cell, short or long compared to a B-cell. - correct answer ✔✔Long
If you are heterozygous for the MHC (HLA) genes how many presenting MHC (HLA) molecules do you
have? - correct answer ✔✔12 MHC molecules, which you can bind 120,000 different peptides
Thymocytes gene rearrangement; b, g and d chain genes (when) - correct answer ✔✔About the same
time. Gamma and Delta "race" with Beta, if GD wins it becomes a committed GD cell. If B wins a second
"race" starts with GD and alpha. IF GD wins it becomes a committed GD cell. If A wins it becomes a
committed AB cell. AB wins the vast majority of the time.
Deletion of the d chain genes how does this happen and when does this happen? - correct answer
✔✔When the alpha chain gene is rearranged the delta chain will be automatically deleted.
Which type of T cell receptor predominates αβ or γδ? - correct answer ✔✔Alpha-Beta
Rearrangement of a b-chain, how many possible attempts do they have to make a functional
rearrangement. - correct answer ✔✔4
When are CD 4 and 8 co-expressed, before or after beta chain rearrangement? When is a thymocyte
considered a single positive cell (before or after positive selection)? - correct answer ✔✔After Beta chain
rearrangement.
after positive selection
What is positive selection? Where is it done, what cells mediate it, what is being checked and what
happens to the T-cell? - correct answer ✔✔Positive selection takes place in the cortex of the thymus and
is mediated by cortical epithelial cells bearing complexes of class 1 and class II self-MHC and self
peptides. Testing for recognition of self-MHC and self-peptide on abTCR of thymocytes.
Los beneficios de comprar resúmenes en Stuvia estan en línea:
Garantiza la calidad de los comentarios
Compradores de Stuvia evaluaron más de 700.000 resúmenes. Así estas seguro que compras los mejores documentos!
Compra fácil y rápido
Puedes pagar rápidamente y en una vez con iDeal, tarjeta de crédito o con tu crédito de Stuvia. Sin tener que hacerte miembro.
Enfócate en lo más importante
Tus compañeros escriben los resúmenes. Por eso tienes la seguridad que tienes un resumen actual y confiable. Así llegas a la conclusión rapidamente!
Preguntas frecuentes
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
100% de satisfacción garantizada: ¿Cómo funciona?
Nuestra garantía de satisfacción le asegura que siempre encontrará un documento de estudio a tu medida. Tu rellenas un formulario y nuestro equipo de atención al cliente se encarga del resto.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Sakayobako30. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
45,681 summaries were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now