Immunology quizzes
How the immune system learns to fight threats without attacking the body, and the thymus’s role in that balance.
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From Immunology: Why the Thymus Culls Most of Its Recruits
Natural killer cells destroy some virus-infected and cancer cells. What often tips them off?
- The cell grows larger than normal
- The cell stops displaying MHC class I
- The cell starts making antibodies
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Answer: The cell stops displaying MHC class I
Many viruses and tumors hide from killer T cells by removing MHC class I; natural killer cells treat this 'missing self' as a danger signal and attack.
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