Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 56 of 99
The passive form of immunity acquired naturally by a newborn infant from its mother occurs through:
A
Transplacental maternal antibody transfer and colostrum breastfeeding
B
Active endogenous memory cell production
C
Routine childhood vaccination
D
Innate skin barrier maturity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Transplacental maternal antibody transfer and colostrum breastfeeding
Concept: Naturally acquired passive maternal immunity.

Solution: Maternal \(\text{IgG}\) crosses the placenta during pregnancy, and maternal \(\text{IgA}\) is transferred through breast milk/colostrum. This provides the infant with naturally acquired passive immunity.

Why other options are incorrect:
  • Option B & Option C: These describe active immunity modalities where the infant's own lymphocytes respond to antigens.

  • Option D: Skin maturity represents innate physical defense, not inherited humoral immunity.

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