CTLs can kill cells infected with viruses or intracellular bacteria. They also can kill cancerous cells....
CTLs can kill cells infected with viruses or intracellular bacteria. They also can kill cancerous cells. How might an infected or cancerous cell evade immune control by CTLs?
Increased expression of MHC class II molecules.
Increased expression of MHC class I molecules.
Decreased expression of MHC class I molecules.
Homework Answers
CTLs can kill those cells only which express the MHC class l protein on their cell membrane because CD-8 protein present on the CTLs binds to MHC I on target cells which activate CTLs to kill the target cells. If a cell is not expressing the MHC I than it can easily evade CTLs killing.
Hence option 3 becomes right.
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