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Question 9 1 pts Natural killer cells target cells that lack MHC-Ion their surface. True O False 1 pts Question 10 the differ
Question 12 1 pts Match the term with the method of complement activation classical pathway [Choose] alternate pathway [Choos
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Answer to question 9) True , explanation :MHC 1is expressed in most of our normal body cells .Natural killer cell is able to identify this mhc1 and gets inactivated .In case of cancer or viral infected cells they lose the MHC molecule on their surface and then they are killed by natural killer cells .

Answer to question 10)classical compliment is activated by the formation of antigen-antibody complexes .

Lectin pathway is initiated when mannose sugar on surface of bacteria binds with mannose binding lectin receptor on our immune cells .

Alternate pathway is activated when complement protein C3 starts directly binding to the pathogen by forming c3Bb complexes .

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