The modern concept of gene is
- A$A$ segment of $DNA$ capable of crossing over
- B$A$ functional unit of $DNA$
- C$A$ segment of $DNA$
- D$A$ segment of chromosome
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In a $DNA$ molecule,one chain contains $22$ thymine and its opposite chain contains $28$ guanine. What is the length of this $DNA$ in $\mathring{A}$?
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