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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Given below are two statements. Based on them,select the correct option given below.
Statement $I$: $N_2$ fixing heterocystic cyanobacteria is Anabaena.
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