Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 52 of 99
In response to an intracellular viral invasion, infected host cells synthesize and release signaling glycoproteins called:
A
Interferons
B
Antibodies
C
Histamines
D
Antigens
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Interferons
Concept: Antiviral cytokine defense.

Solution: Interferons (Type I: \(\alpha\) and \(\beta\)) are secreted by virus-infected cells. They bind to neighboring uninfected cells, inducing an antiviral state that blocks viral mRNA translation and replication.

Why other options are incorrect:
  • Option B: Antibodies are secreted by plasma B-cells into extracellular fluids, not secreted directly by infected non-immune tissue cells to signal neighbors.

  • Option C: Histamines cause vasodilation during allergic/inflammatory responses.

  • Option D: Antigens are foreign molecules recognized by the host.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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