MCQ
A single stranded $DNA $ molecule is the genetic material of bacteriophage
- A$T_2$
- B$T_4$
- ✓$\phi × 174$
- D$\lambda$
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Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.
$A.$ Maternal mortality rate $(MMR)$ $B.$ Infant mortality rate $(IMR)$
$C.$ Number of people in reproducible age $D.$ Death rate