Biology Immunity SZABMU 2023
PMDC Verified Question 70 of 99
Which may NOT be a possible action of interferons?
A
Belongs to cytokines
B
Activate natural killer cells
C
Activate immune cells
D
Secrete interleukin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Secrete interleukin
Concept:

Interferons are signaling proteins (cytokines) released by host cells in response to the presence of pathogens, particularly viruses.

Formula:

None

Solution:

  • Interferons act as distress signals. They belong to the cytokine family (A is true).


  • They actively "interfere" with viral replication and activate other immune cells (C is true), including Natural Killer (NK) cells and macrophages (B is true).


  • However, interferons themselves are just protein molecules; they are not living cells, and therefore they do not have the cellular machinery to secrete interleukins. Cells secrete cytokines, not the other way around.


Why other options are incorrect:

  • Options A, B, and C describe valid properties or downstream effects of interferons.

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