Table of contents

1. Introduction to Microbiology3h 22m
2. Disproving Spontaneous Generation1h 18m
3. Chemical Principles of Microbiology3h 38m
4. Water1h 28m
5. Molecules of Microbiology2h 23m
6. Cell Membrane & Transport3h 28m
7. Prokaryotic Cell Structures & Functions5h 52m
8. Eukaryotic Cell Structures & Functions2h 18m
9. Microscopes2h 46m
10. Dynamics of Microbial Growth4h 36m
11. Controlling Microbial Growth4h 10m
12. Microbial Metabolism5h 16m
13. Photosynthesis2h 31m
14. DNA Replication2h 25m
15. Central Dogma & Gene Regulation7h 14m
16. Microbial Genetics4h 44m
17. Biotechnology3h 0m
18. Viruses, Viroids, & Prions4h 56m
19. Innate Immunity7h 15m
20. Adaptive Immunity7h 14m
21. Principles of Disease6h 57m

20. Adaptive Immunity

Natural Killer Cells

Microbiology

20. Adaptive Immunity

Natural Killer Cells

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Multiple Choice

How are natural killer cells able to kill infected host cells?

NK cells bind to IgG antibodies on the infected cell's surface and send apoptosis signals to the infected cell.

NK cells send perforin and protease granules to the infected cell triggering apoptosis of the infected cell.

NK cells bind to antigens on the infected cell's surface and send signals triggering apoptosis of the infected cell.

NK cells mark infected cells for destruction and the infected cell will later be destroyed by cytotoxic t cells.

A and B.

C and D.

D only.

All of the above.

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Verified step by step guidance

Understand the role of natural killer (NK) cells: NK cells are a type of lymphocyte in the immune system that play a crucial role in the host-rejection of both tumors and virally infected cells.

Identify the mechanisms by which NK cells induce apoptosis: NK cells can induce apoptosis in infected cells through the release of cytotoxic granules containing perforin and granzymes, which are proteases that trigger cell death.

Examine the role of antibodies: NK cells can recognize infected cells through antibody-dependent cellular cytotoxicity (ADCC), where they bind to IgG antibodies that are attached to antigens on the surface of infected cells.

Consider the interaction with other immune cells: NK cells can also interact with other immune cells, such as cytotoxic T cells, to enhance the immune response against infected cells.

Evaluate the options given: Analyze each option to determine which mechanisms are described and whether they align with the known functions of NK cells, focusing on the correct combination of mechanisms that NK cells use to kill infected host cells.