Biology Forum Genetics linking no.

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      The term Linking number [LK] defines a quantitative measure for
      a) topologcal linkage of two complementary DNA strands in a double-stranded DNA molecule
      b) action of topoisomerase enzymes
      c) no. of subunits which constitute a functional lac repressor
      d) no. of times the two complementary DNA strands wind about each other in a double-stranded DNA

      answer can be multiple
      my guess; d
      im not sure whether d) alone is correct and IF a) is a correct option too

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