In one turn of the $DNA$ helix,there are $.........\,bp$ and its length is $.........$.

  • A
    $10, 0.34\,nm$
  • B
    $20, 0.34\,nm$
  • C
    $10, 3.4\,nm$
  • D
    $20, 3.4\,nm$

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$DNA$ consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is $AGCTTCGA$,then the nucleotide sequence in the other chain shall be:

The nucleosome core is made up of ............ .

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