Acquired immunity is characterised by:
ABeing present at birth and non-specific
BBeing pathogen-specific AND having immunological memory (intensified secondary/anamnestic response on re-exposure)
CBeing inherited only from the mother
DActing only on bacteria
Answer & Solution
Correct answer: B. Being pathogen-specific AND having immunological memory (intensified secondary/anamnestic response on re-exposure)
**Acquired immunity** = **pathogen-specific + has memory**. First encounter → low-intensity primary response. Subsequent encounter with the same pathogen → highly intensified **secondary (anamnestic) response**. Carried out by B-lymphocytes (humoral) and T-lymphocytes (cell-mediated).
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