There is no $DNA$ in

  • A
    mature $RBCs$
  • B
    a mature spermatozoan
  • C
    hair root
  • D
    an enucleated ovum

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The smallest $WBC$ is . . . . . . .

$A$: Blood group phenotype is controlled by the presence or absence of antigens present on the surface coating of $RBC$.
$R$: These antigens are of three types and are found in the oligosaccharide-rich head regions of a glycophorin.

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Platelets are

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