Question

Given below is a list of steps Meselson and Stahl carried out in their experiment to prove that DNA replication is semi-conservative. Select the option that gives the correct sequence of steps followed by them.(i) Bacteria transferred to a N¹⁴ medium and sampled every 20 minutes.(ii) All bacteria contain hybrid DNA (N¹⁴ DNA and N¹⁵DNA).(iii) Bacteria grown in N¹⁵ medium for many generations.(iv) All bacteria contain N¹⁵ DNA.(v) Bacteria contain either all N¹⁴ DNA or all hybrid DNA.

Options :

  1. (ii) → (iv) → (iii) → (i) → (v)

  2. (i) → (ii) → (v) → (iv) → (iii)

  3. (iii) → (iv) → (i) → (ii) → (v)

  4. (iv) → (iii) → (ii) → (v) → (i)

Show Answer

Answer :

(iii) → (iv) → (i) → (ii) → (v)

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