When a CD8+ cell encounters an MHC presented antigen epitope the CD8+ T-cell cel
ID: 92162 • Letter: W
Question
When a CD8+ cell encounters an MHC presented antigen epitope the CD8+ T-cell cell s activated to become a cytotoxic True False Mammalian red blood cells express MHC molecules on their surface. True False We often collect blood samples from animals in the field to evaluate immune system function. If we spin the blood in a centrifuge and remove the plasma from the blood cells and test the plasma for ability to destroy bacterial cells we are likely looking at the function of which component of the immune system? MHC molecules Lymphocytes. Complement proteins Eosinophils order the steps by which the immune system responds to a bacterial infection. Cytokines are released to signal that a bacterial cell is present. The bacteria are engulfed by phagosytosis. Leukocytes increase in the area of infection. Toll-like receptors on macrophages recognize PAMPs on the surface of the bacteria.Explanation / Answer
Que 1
Ans:
When a CD8+ cell encounters an MHC presented antigen epitope the CD8+ cell is activated to become a cytotoxic T-cell : True.
Explanation:
- CD8+ T cells often called cytotoxic T lymphocytes or CTLs.
- CD8+ T cells recognize antigen with class I MHC molecules on target cells and activated to become cytotoxic T cells.
Que 2.
Ans:
Mammalian red blood cells express MHC molecules on their surface: False.
Explanation:
- Human red blood cells are not nucleated and do not express any MHC molecules.
Que 3
Ans:
We often collect blood samples from animals in the field to evaluate immune system function. If we spin the blood in a centrifuge and remove the plasma from the blood cells and test the plasma for ability to destroy bacterial cells we are looking at the function of component of the immune system is: Complement proteins.
Explanation:
- Complement proteins are composed of about 20 plasma proteins.
- Complement proteins acts as defense against bacteria.
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