Which of the following features is correct for bacteria?

  • A
    Presence of intervening sequences in $DNA$
  • B
    $DNA$ does not show coiling
  • C
    Linear $ss-DNA$ representing single chromosome
  • D
    $DNA$ can be chromosomal as well as extrachromosomal

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$P$. Salty areas$I$. Thermoacidophiles
$Q$. Marshy areas$II$. Methanogens
$R$. Hot springs$III$. Halophiles

Which among the following are the smallest living cells,known without a definite cell wall,pathogenic to plants as well as animals and can survive without oxygen?

The mode equivalent to sexual reproduction in bacteria is:

According to Bradley and Carr,the nitrogen fixation takes place in

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